Initial import attempt, just to play with. Many things disabled/removed

ui/cc/GraphicsLayerChromium.cpp

+/*
+ * Copyright (C) 2010 Google Inc. All rights reserved.
+ * Copyright (C) 2009 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+/** FIXME
+ * This file borrows code heavily from platform/graphics/win/GraphicsLayerCACF.cpp
+ * (and hence it includes both copyrights)
+ * Ideally the common code (mostly the code that keeps track of the layer hierarchy)
+ * should be kept separate and shared between platforms. It would be a well worthwhile
+ * effort once the Windows implementation (binaries and headers) of CoreAnimation is
+ * checked in to the WebKit repository. Until then only Apple can make this happen.
+ */
+
+#include "config.h"
+
+#if USE(ACCELERATED_COMPOSITING)
+
+#include "GraphicsLayerChromium.h"
+
+#include "AnimationIdVendor.h"
+#include "AnimationTranslationUtil.h"
+#include "ContentLayerChromium.h"
+#include "FloatConversion.h"
+#include "FloatRect.h"
+#include "GraphicsContext.h"
+#include "Image.h"
+#include "LayerChromium.h"
+#include "LinkHighlight.h"
+#include "NativeImageSkia.h"
+#include "PlatformContextSkia.h"
+#include "PlatformString.h"
+#include "SkMatrix44.h"
+#include "SystemTime.h"
+
+#include "cc/CCActiveAnimation.h"
+
+#include <public/WebFilterOperation.h>
+#include <public/WebFilterOperations.h>
+#include <public/WebFloatPoint.h>
+#include <public/WebFloatRect.h>
+#include <public/WebImageLayer.h>
+#include <public/WebSize.h>
+#include <public/WebTransformationMatrix.h>
+#include <wtf/CurrentTime.h>
+#include <wtf/StringExtras.h>
+#include <wtf/text/CString.h>
+
+using namespace std;
+using namespace WebKit;
+
+namespace WebCore {
+
+PassOwnPtr<GraphicsLayer> GraphicsLayer::create(GraphicsLayerClient* client)
+{
+    return adoptPtr(new GraphicsLayerChromium(client));
+}
+
+GraphicsLayerChromium::GraphicsLayerChromium(GraphicsLayerClient* client)
+    : GraphicsLayer(client)
+    , m_contentsLayerPurpose(NoContentsLayer)
+    , m_contentsLayerHasBackgroundColor(false)
+    , m_inSetChildren(false)
+    , m_pageScaleChanged(false)
+{
+    m_opaqueRectTrackingContentLayerDelegate = adoptPtr(new OpaqueRectTrackingContentLayerDelegate(this));
+    m_layer = WebContentLayer::create(m_opaqueRectTrackingContentLayerDelegate.get());
+    m_layer.setDrawsContent(m_drawsContent && m_contentsVisible);
+    if (client)
+        deviceOrPageScaleFactorChanged();
+    updateDebugIndicators();
+}
+
+GraphicsLayerChromium::~GraphicsLayerChromium()
+{
+    // Do cleanup while we can still safely call methods on the derived class.
+    willBeDestroyed();
+}
+
+void GraphicsLayerChromium::willBeDestroyed()
+{
+    if (!m_layer.isNull()) {
+        m_layer.clearClient();
+        m_layer.unwrap<LayerChromium>()->clearRenderSurface();
+        m_layer.unwrap<LayerChromium>()->setLayerAnimationDelegate(0);
+    }
+
+    if (!m_contentsLayer.isNull()) {
+        m_contentsLayer.unwrap<LayerChromium>()->clearRenderSurface();
+        m_contentsLayer.unwrap<LayerChromium>()->setLayerAnimationDelegate(0);
+    }
+
+    if (!m_transformLayer.isNull()) {
+        m_transformLayer.unwrap<LayerChromium>()->clearRenderSurface();
+        m_transformLayer.unwrap<LayerChromium>()->setLayerAnimationDelegate(0);
+    }
+
+    if (m_linkHighlight)
+        m_linkHighlight.clear();
+
+    GraphicsLayer::willBeDestroyed();
+}
+
+void GraphicsLayerChromium::setName(const String& inName)
+{
+    m_nameBase = inName;
+    String name = String::format("GraphicsLayerChromium(%p) GraphicsLayer(%p) ", m_layer.unwrap<LayerChromium>(), this) + inName;
+    GraphicsLayer::setName(name);
+    updateNames();
+}
+
+void GraphicsLayerChromium::updateNames()
+{
+    if (!m_layer.isNull())
+        m_layer.unwrap<LayerChromium>()->setDebugName("Layer for " + m_nameBase);
+    if (!m_transformLayer.isNull())
+        m_transformLayer.unwrap<LayerChromium>()->setDebugName("TransformLayer for " + m_nameBase);
+    if (!m_contentsLayer.isNull())
+        m_contentsLayer.unwrap<LayerChromium>()->setDebugName("ContentsLayer for " + m_nameBase);
+    if (m_linkHighlight)
+        m_linkHighlight->contentLayer()->setDebugName("LinkHighlight for " + m_nameBase);
+}
+
+bool GraphicsLayerChromium::setChildren(const Vector<GraphicsLayer*>& children)
+{
+    m_inSetChildren = true;
+    bool childrenChanged = GraphicsLayer::setChildren(children);
+
+    if (childrenChanged)
+        updateChildList();
+    m_inSetChildren = false;
+
+    return childrenChanged;
+}
+
+void GraphicsLayerChromium::addChild(GraphicsLayer* childLayer)
+{
+    GraphicsLayer::addChild(childLayer);
+    if (!m_inSetChildren)
+        updateChildList();
+}
+
+void GraphicsLayerChromium::addChildAtIndex(GraphicsLayer* childLayer, int index)
+{
+    GraphicsLayer::addChildAtIndex(childLayer, index);
+    updateChildList();
+}
+
+void GraphicsLayerChromium::addChildBelow(GraphicsLayer* childLayer, GraphicsLayer* sibling)
+{
+    GraphicsLayer::addChildBelow(childLayer, sibling);
+    updateChildList();
+}
+
+void GraphicsLayerChromium::addChildAbove(GraphicsLayer* childLayer, GraphicsLayer *sibling)
+{
+    GraphicsLayer::addChildAbove(childLayer, sibling);
+    updateChildList();
+}
+
+bool GraphicsLayerChromium::replaceChild(GraphicsLayer* oldChild, GraphicsLayer* newChild)
+{
+    if (GraphicsLayer::replaceChild(oldChild, newChild)) {
+        updateChildList();
+        return true;
+    }
+    return false;
+}
+
+void GraphicsLayerChromium::removeFromParent()
+{
+    GraphicsLayer::removeFromParent();
+    layerForParent().removeFromParent();
+}
+
+void GraphicsLayerChromium::setPosition(const FloatPoint& point)
+{
+    GraphicsLayer::setPosition(point);
+    updateLayerPosition();
+}
+
+void GraphicsLayerChromium::setAnchorPoint(const FloatPoint3D& point)
+{
+    GraphicsLayer::setAnchorPoint(point);
+    updateAnchorPoint();
+}
+
+void GraphicsLayerChromium::setSize(const FloatSize& size)
+{
+    // We are receiving negative sizes here that cause assertions to fail in the compositor. Clamp them to 0 to
+    // avoid those assertions.
+    // FIXME: This should be an ASSERT instead, as negative sizes should not exist in WebCore.
+    FloatSize clampedSize = size;
+    if (clampedSize.width() < 0 || clampedSize.height() < 0)
+        clampedSize = FloatSize();
+
+    if (clampedSize == m_size)
+        return;
+
+    GraphicsLayer::setSize(clampedSize);
+    updateLayerSize();
+
+    if (m_pageScaleChanged && !m_layer.isNull())
+        m_layer.invalidate();
+    m_pageScaleChanged = false;
+}
+
+void GraphicsLayerChromium::setTransform(const TransformationMatrix& transform)
+{
+    // Call this method first to assign contents scale to our layer so the painter can apply the scale transform.
+    updateContentsScale();
+
+    GraphicsLayer::setTransform(transform);
+    updateTransform();
+}
+
+void GraphicsLayerChromium::setChildrenTransform(const TransformationMatrix& transform)
+{
+    GraphicsLayer::setChildrenTransform(transform);
+    updateChildrenTransform();
+}
+
+void GraphicsLayerChromium::setPreserves3D(bool preserves3D)
+{
+    if (preserves3D == m_preserves3D)
+        return;
+
+    GraphicsLayer::setPreserves3D(preserves3D);
+    updateLayerPreserves3D();
+}
+
+void GraphicsLayerChromium::setMasksToBounds(bool masksToBounds)
+{
+    GraphicsLayer::setMasksToBounds(masksToBounds);
+    updateMasksToBounds();
+}
+
+void GraphicsLayerChromium::setDrawsContent(bool drawsContent)
+{
+    // Note carefully this early-exit is only correct because we also properly initialize
+    // LayerChromium::m_isDrawable whenever m_contentsLayer is set to a new layer in setupContentsLayer().
+    if (drawsContent == m_drawsContent)
+        return;
+
+    GraphicsLayer::setDrawsContent(drawsContent);
+    updateLayerIsDrawable();
+}
+
+void GraphicsLayerChromium::setContentsVisible(bool contentsVisible)
+{
+    // Note carefully this early-exit is only correct because we also properly initialize
+    // LayerChromium::m_isDrawable whenever m_contentsLayer is set to a new layer in setupContentsLayer().
+    if (contentsVisible == m_contentsVisible)
+        return;
+
+    GraphicsLayer::setContentsVisible(contentsVisible);
+    updateLayerIsDrawable();
+}
+
+void GraphicsLayerChromium::setBackgroundColor(const Color& color)
+{
+    GraphicsLayer::setBackgroundColor(color.rgb());
+
+    m_contentsLayerHasBackgroundColor = true;
+    updateLayerBackgroundColor();
+}
+
+void GraphicsLayerChromium::clearBackgroundColor()
+{
+    GraphicsLayer::clearBackgroundColor();
+    m_contentsLayer.setBackgroundColor(static_cast<RGBA32>(0));
+}
+
+void GraphicsLayerChromium::setContentsOpaque(bool opaque)
+{
+    GraphicsLayer::setContentsOpaque(opaque);
+    m_layer.setOpaque(m_contentsOpaque);
+}
+
+static bool copyWebCoreFilterOperationsToWebFilterOperations(const FilterOperations& filters, WebFilterOperations& webFilters)
+{
+    for (size_t i = 0; i < filters.size(); ++i) {
+        const FilterOperation& op = *filters.at(i);
+        switch (op.getOperationType()) {
+        case FilterOperation::REFERENCE:
+            return false; // Not supported.
+        case FilterOperation::GRAYSCALE:
+        case FilterOperation::SEPIA:
+        case FilterOperation::SATURATE:
+        case FilterOperation::HUE_ROTATE: {
+            float amount = static_cast<const BasicColorMatrixFilterOperation*>(&op)->amount();
+            switch (op.getOperationType()) {
+            case FilterOperation::GRAYSCALE:
+                webFilters.append(WebFilterOperation::createGrayscaleFilter(amount));
+                break;
+            case FilterOperation::SEPIA:
+                webFilters.append(WebFilterOperation::createSepiaFilter(amount));
+                break;
+            case FilterOperation::SATURATE:
+                webFilters.append(WebFilterOperation::createSaturateFilter(amount));
+                break;
+            case FilterOperation::HUE_ROTATE:
+                webFilters.append(WebFilterOperation::createHueRotateFilter(amount));
+                break;
+            default:
+                ASSERT_NOT_REACHED();
+            }
+            break;
+        }
+        case FilterOperation::INVERT:
+        case FilterOperation::OPACITY:
+        case FilterOperation::BRIGHTNESS:
+        case FilterOperation::CONTRAST: {
+            float amount = static_cast<const BasicComponentTransferFilterOperation*>(&op)->amount();
+            switch (op.getOperationType()) {
+            case FilterOperation::INVERT:
+                webFilters.append(WebFilterOperation::createInvertFilter(amount));
+                break;
+            case FilterOperation::OPACITY:
+                webFilters.append(WebFilterOperation::createOpacityFilter(amount));
+                break;
+            case FilterOperation::BRIGHTNESS:
+                webFilters.append(WebFilterOperation::createBrightnessFilter(amount));
+                break;
+            case FilterOperation::CONTRAST:
+                webFilters.append(WebFilterOperation::createContrastFilter(amount));
+                break;
+            default:
+                ASSERT_NOT_REACHED();
+            }
+            break;
+        }
+        case FilterOperation::BLUR: {
+            float pixelRadius = static_cast<const BlurFilterOperation*>(&op)->stdDeviation().getFloatValue();
+            webFilters.append(WebFilterOperation::createBlurFilter(pixelRadius));
+            break;
+        }
+        case FilterOperation::DROP_SHADOW: {
+            const DropShadowFilterOperation& dropShadowOp = *static_cast<const DropShadowFilterOperation*>(&op);
+            webFilters.append(WebFilterOperation::createDropShadowFilter(WebPoint(dropShadowOp.x(), dropShadowOp.y()), dropShadowOp.stdDeviation(), dropShadowOp.color().rgb()));
+            break;
+        }
+#if ENABLE(CSS_SHADERS)
+        case FilterOperation::CUSTOM:
+            return false; // Not supported.
+#endif
+        case FilterOperation::PASSTHROUGH:
+        case FilterOperation::NONE:
+            break;
+        }
+    }
+    return true;
+}
+
+bool GraphicsLayerChromium::setFilters(const FilterOperations& filters)
+{
+    WebFilterOperations webFilters;
+    if (!copyWebCoreFilterOperationsToWebFilterOperations(filters, webFilters))
+        return false;
+    m_layer.setFilters(webFilters);
+    return GraphicsLayer::setFilters(filters);
+}
+
+void GraphicsLayerChromium::setBackgroundFilters(const FilterOperations& filters)
+{
+    WebFilterOperations webFilters;
+    if (!copyWebCoreFilterOperationsToWebFilterOperations(filters, webFilters))
+        return;
+    m_layer.setBackgroundFilters(webFilters);
+}
+
+void GraphicsLayerChromium::setMaskLayer(GraphicsLayer* maskLayer)
+{
+    if (maskLayer == m_maskLayer)
+        return;
+
+    GraphicsLayer::setMaskLayer(maskLayer);
+
+    LayerChromium* maskLayerChromium = m_maskLayer ? m_maskLayer->platformLayer() : 0;
+    m_layer.unwrap<LayerChromium>()->setMaskLayer(maskLayerChromium);
+}
+
+void GraphicsLayerChromium::setBackfaceVisibility(bool visible)
+{
+    GraphicsLayer::setBackfaceVisibility(visible);
+    m_layer.setDoubleSided(m_backfaceVisibility);
+}
+
+void GraphicsLayerChromium::setOpacity(float opacity)
+{
+    float clampedOpacity = max(min(opacity, 1.0f), 0.0f);
+    GraphicsLayer::setOpacity(clampedOpacity);
+    primaryLayer().setOpacity(opacity);
+}
+
+void GraphicsLayerChromium::setReplicatedByLayer(GraphicsLayer* layer)
+{
+    GraphicsLayerChromium* layerChromium = static_cast<GraphicsLayerChromium*>(layer);
+    GraphicsLayer::setReplicatedByLayer(layer);
+    LayerChromium* replicaLayer = layerChromium ? layerChromium->primaryLayer().unwrap<LayerChromium>() : 0;
+    primaryLayer().unwrap<LayerChromium>()->setReplicaLayer(replicaLayer);
+}
+
+
+void GraphicsLayerChromium::setContentsNeedsDisplay()
+{
+    if (!m_contentsLayer.isNull())
+        m_contentsLayer.invalidate();
+}
+
+void GraphicsLayerChromium::setNeedsDisplay()
+{
+    if (drawsContent())
+        m_layer.invalidate();
+}
+
+void GraphicsLayerChromium::setNeedsDisplayInRect(const FloatRect& rect)
+{
+    if (drawsContent())
+        m_layer.invalidateRect(rect);
+}
+
+void GraphicsLayerChromium::setContentsRect(const IntRect& rect)
+{
+    if (rect == m_contentsRect)
+        return;
+
+    GraphicsLayer::setContentsRect(rect);
+    updateContentsRect();
+}
+
+void GraphicsLayerChromium::setContentsToImage(Image* image)
+{
+    bool childrenChanged = false;
+    if (image) {
+        if (m_contentsLayer.isNull() || m_contentsLayerPurpose != ContentsLayerForImage) {
+            WebKit::WebImageLayer imageLayer = WebKit::WebImageLayer::create();
+            setupContentsLayer(imageLayer.unwrap<LayerChromium>());
+            m_contentsLayerPurpose = ContentsLayerForImage;
+            childrenChanged = true;
+        }
+        WebKit::WebImageLayer imageLayer = m_contentsLayer.to<WebKit::WebImageLayer>();
+        NativeImageSkia* nativeImage = image->nativeImageForCurrentFrame();
+        imageLayer.setBitmap(nativeImage->bitmap());
+        imageLayer.setOpaque(image->isBitmapImage() && !image->currentFrameHasAlpha());
+        updateContentsRect();
+    } else {
+        if (!m_contentsLayer.isNull()) {
+            childrenChanged = true;
+
+            // The old contents layer will be removed via updateChildList.
+            m_contentsLayer.reset();
+        }
+    }
+
+    if (childrenChanged)
+        updateChildList();
+}
+
+void GraphicsLayerChromium::setContentsToCanvas(PlatformLayer* platformLayer)
+{
+    bool childrenChanged = false;
+    if (platformLayer) {
+        if (m_contentsLayer.unwrap<LayerChromium>() != platformLayer) {
+            setupContentsLayer(platformLayer);
+            m_contentsLayerPurpose = ContentsLayerForCanvas;
+            childrenChanged = true;
+        }
+        updateContentsRect();
+    } else {
+        if (!m_contentsLayer.isNull()) {
+            childrenChanged = true;
+
+            // The old contents layer will be removed via updateChildList.
+            m_contentsLayer.reset();
+        }
+    }
+
+    if (childrenChanged)
+        updateChildList();
+}
+
+bool GraphicsLayerChromium::addAnimation(const KeyframeValueList& values, const IntSize& boxSize, const Animation* animation, const String& animationName, double timeOffset)
+{
+    // Bail early if we have a large rotation.
+    if (values.property() == AnimatedPropertyWebkitTransform) {
+        bool hasRotationOfMoreThan180Degrees = false;
+        validateTransformOperations(values, hasRotationOfMoreThan180Degrees);
+        if (hasRotationOfMoreThan180Degrees)
+            return false;
+    }
+
+    primaryLayer().unwrap<LayerChromium>()->setLayerAnimationDelegate(this);
+
+    int animationId = mapAnimationNameToId(animationName);
+    int groupId = AnimationIdVendor::getNextGroupId();
+
+    OwnPtr<CCActiveAnimation> toAdd(createActiveAnimation(values, animation, animationId, groupId, timeOffset, boxSize));
+
+    if (toAdd.get()) {
+        // Remove any existing animations with the same animation id and target property.
+        primaryLayer().unwrap<LayerChromium>()->layerAnimationController()->removeAnimation(toAdd->id(), toAdd->targetProperty());
+        return primaryLayer().unwrap<LayerChromium>()->addAnimation(toAdd.release());
+    }
+
+    return false;
+}
+
+void GraphicsLayerChromium::pauseAnimation(const String& animationName, double timeOffset)
+{
+    primaryLayer().unwrap<LayerChromium>()->pauseAnimation(mapAnimationNameToId(animationName), timeOffset);
+}
+
+void GraphicsLayerChromium::removeAnimation(const String& animationName)
+{
+    primaryLayer().unwrap<LayerChromium>()->removeAnimation(mapAnimationNameToId(animationName));
+}
+
+void GraphicsLayerChromium::suspendAnimations(double wallClockTime)
+{
+    // |wallClockTime| is in the wrong time base. Need to convert here.
+    // FIXME: find a more reliable way to do this.
+    double monotonicTime = wallClockTime + monotonicallyIncreasingTime() - currentTime();
+    primaryLayer().unwrap<LayerChromium>()->suspendAnimations(monotonicTime);
+}
+
+void GraphicsLayerChromium::resumeAnimations()
+{
+    primaryLayer().unwrap<LayerChromium>()->resumeAnimations(monotonicallyIncreasingTime());
+}
+
+void GraphicsLayerChromium::addLinkHighlight(const Path& path)
+{
+    m_linkHighlight = LinkHighlight::create(this, path, AnimationIdVendor::LinkHighlightAnimationId, AnimationIdVendor::getNextGroupId());
+    updateChildList();
+}
+
+void GraphicsLayerChromium::didFinishLinkHighlight()
+{
+    if (m_linkHighlight)
+        m_linkHighlight->contentLayer()->removeFromParent();
+
+    m_linkHighlight.clear();
+}
+
+void GraphicsLayerChromium::setContentsToMedia(PlatformLayer* layer)
+{
+    bool childrenChanged = false;
+    if (layer) {
+        if (m_contentsLayer.isNull() || m_contentsLayerPurpose != ContentsLayerForVideo) {
+            setupContentsLayer(layer);
+            m_contentsLayerPurpose = ContentsLayerForVideo;
+            childrenChanged = true;
+        }
+        updateContentsRect();
+    } else {
+        if (!m_contentsLayer.isNull()) {
+            childrenChanged = true;
+
+            // The old contents layer will be removed via updateChildList.
+            m_contentsLayer.reset();
+        }
+    }
+
+    if (childrenChanged)
+        updateChildList();
+}
+
+WebLayer GraphicsLayerChromium::hostLayerForChildren() const
+{
+    return m_transformLayer.isNull() ? m_layer :  m_transformLayer;
+}
+
+WebLayer GraphicsLayerChromium::layerForParent() const
+{
+    return m_transformLayer.isNull() ? m_layer :  m_transformLayer;
+}
+
+PlatformLayer* GraphicsLayerChromium::platformLayer() const
+{
+    return primaryLayer().unwrap<LayerChromium>();
+}
+
+void GraphicsLayerChromium::setDebugBackgroundColor(const Color& color)
+{
+    if (color.isValid())
+        m_layer.setBackgroundColor(color.rgb());
+    else
+        m_layer.setBackgroundColor(static_cast<RGBA32>(0));
+}
+
+void GraphicsLayerChromium::setDebugBorder(const Color& color, float borderWidth)
+{
+    if (color.isValid()) {
+        m_layer.setDebugBorderColor(color.rgb());
+        m_layer.setDebugBorderWidth(borderWidth);
+    } else {
+        m_layer.setDebugBorderColor(static_cast<RGBA32>(0));
+        m_layer.setDebugBorderWidth(0);
+    }
+}
+
+void GraphicsLayerChromium::updateChildList()
+{
+    Vector<RefPtr<LayerChromium> > newChildren;
+
+    if (!m_transformLayer.isNull()) {
+        // Add the primary layer first. Even if we have negative z-order children, the primary layer always comes behind.
+        newChildren.append(m_layer.unwrap<LayerChromium>());
+    } else if (!m_contentsLayer.isNull()) {
+        // FIXME: add the contents layer in the correct order with negative z-order children.
+        // This does not cause visible rendering issues because currently contents layers are only used
+        // for replaced elements that don't have children.
+        newChildren.append(m_contentsLayer.unwrap<LayerChromium>());
+    }
+
+    const Vector<GraphicsLayer*>& childLayers = children();
+    size_t numChildren = childLayers.size();
+    for (size_t i = 0; i < numChildren; ++i) {
+        GraphicsLayerChromium* curChild = static_cast<GraphicsLayerChromium*>(childLayers[i]);
+
+        LayerChromium* childLayer = curChild->layerForParent().unwrap<LayerChromium>();
+        newChildren.append(childLayer);
+    }
+
+    if (m_linkHighlight)
+        newChildren.append(m_linkHighlight->contentLayer());
+
+    for (size_t i = 0; i < newChildren.size(); ++i)
+        newChildren[i]->removeFromParent();
+
+    if (!m_transformLayer.isNull()) {
+        m_transformLayer.unwrap<LayerChromium>()->setChildren(newChildren);
+
+        if (!m_contentsLayer.isNull()) {
+            // If we have a transform layer, then the contents layer is parented in the
+            // primary layer (which is itself a child of the transform layer).
+            m_layer.removeAllChildren();
+            m_layer.addChild(m_contentsLayer);
+        }
+    } else
+        m_layer.unwrap<LayerChromium>()->setChildren(newChildren);
+}
+
+void GraphicsLayerChromium::updateLayerPosition()
+{
+    // Position is offset on the layer by the layer anchor point.
+    FloatPoint layerPosition(m_position.x() + m_anchorPoint.x() * m_size.width(),
+                             m_position.y() + m_anchorPoint.y() * m_size.height());
+
+    primaryLayer().setPosition(layerPosition);
+}
+
+void GraphicsLayerChromium::updateLayerSize()
+{
+    IntSize layerSize(m_size.width(), m_size.height());
+    if (!m_transformLayer.isNull()) {
+        m_transformLayer.setBounds(layerSize);
+        // The anchor of the contents layer is always at 0.5, 0.5, so the position is center-relative.
+        FloatPoint centerPoint(m_size.width() / 2, m_size.height() / 2);
+        m_layer.setPosition(centerPoint);
+    }
+
+    m_layer.setBounds(layerSize);
+
+    // Note that we don't resize m_contentsLayer. It's up the caller to do that.
+
+    // If we've changed the bounds, we need to recalculate the position
+    // of the layer, taking anchor point into account.
+    updateLayerPosition();
+}
+
+void GraphicsLayerChromium::updateAnchorPoint()
+{
+    primaryLayer().setAnchorPoint(FloatPoint(m_anchorPoint.x(), m_anchorPoint.y()));
+    primaryLayer().setAnchorPointZ(m_anchorPoint.z());
+
+    updateLayerPosition();
+}
+
+void GraphicsLayerChromium::updateTransform()
+{
+    primaryLayer().setTransform(WebTransformationMatrix(m_transform));
+}
+
+void GraphicsLayerChromium::updateChildrenTransform()
+{
+    primaryLayer().setSublayerTransform(WebTransformationMatrix(m_childrenTransform));
+}
+
+void GraphicsLayerChromium::updateMasksToBounds()
+{
+    m_layer.setMasksToBounds(m_masksToBounds);
+    updateDebugIndicators();
+}
+
+void GraphicsLayerChromium::updateLayerPreserves3D()
+{
+    if (m_preserves3D && m_transformLayer.isNull()) {
+        // Create the transform layer.
+        m_transformLayer = WebLayer::create();
+        m_transformLayer.setPreserves3D(true);
+        m_transformLayer.unwrap<LayerChromium>()->setLayerAnimationDelegate(this);
+        m_transformLayer.unwrap<LayerChromium>()->setLayerAnimationController(m_layer.unwrap<LayerChromium>()->releaseLayerAnimationController());
+
+        // Copy the position from this layer.
+        updateLayerPosition();
+        updateLayerSize();
+        updateAnchorPoint();
+        updateTransform();
+        updateChildrenTransform();
+
+        m_layer.setPosition(FloatPoint(m_size.width() / 2.0f, m_size.height() / 2.0f));
+
+        m_layer.setAnchorPoint(FloatPoint(0.5f, 0.5f));
+        m_layer.setTransform(SkMatrix44());
+
+        // Set the old layer to opacity of 1. Further down we will set the opacity on the transform layer.
+        m_layer.setOpacity(1);
+
+        m_layer.setContentsScale(contentsScale());
+
+        // Move this layer to be a child of the transform layer.
+        if (!m_layer.parent().isNull())
+            m_layer.parent().replaceChild(m_layer, m_transformLayer);
+        m_transformLayer.addChild(m_layer);
+
+        updateChildList();
+    } else if (!m_preserves3D && !m_transformLayer.isNull()) {
+        // Relace the transformLayer in the parent with this layer.
+        m_layer.removeFromParent();
+        if (!m_transformLayer.parent().isNull())
+            m_transformLayer.parent().replaceChild(m_transformLayer, m_layer);
+
+        m_layer.unwrap<LayerChromium>()->setLayerAnimationDelegate(this);
+        m_layer.unwrap<LayerChromium>()->setLayerAnimationController(m_transformLayer.unwrap<LayerChromium>()->releaseLayerAnimationController());
+
+        // Release the transform layer.
+        m_transformLayer.unwrap<LayerChromium>()->setLayerAnimationDelegate(0);
+        m_transformLayer.reset();
+
+        updateLayerPosition();
+        updateLayerSize();
+        updateAnchorPoint();
+        updateTransform();
+        updateChildrenTransform();
+
+        updateChildList();
+    }
+
+    m_layer.setPreserves3D(m_preserves3D);
+    primaryLayer().setOpacity(m_opacity);
+    updateNames();
+}
+
+void GraphicsLayerChromium::updateLayerIsDrawable()
+{
+    // For the rest of the accelerated compositor code, there is no reason to make a
+    // distinction between drawsContent and contentsVisible. So, for m_layer, these two
+    // flags are combined here. m_contentsLayer shouldn't receive the drawsContent flag
+    // so it is only given contentsVisible.
+
+    m_layer.setDrawsContent(m_drawsContent && m_contentsVisible);
+
+    if (!m_contentsLayer.isNull())
+        m_contentsLayer.setDrawsContent(m_contentsVisible);
+
+    if (m_drawsContent)
+        m_layer.invalidate();
+
+    updateDebugIndicators();
+}
+
+void GraphicsLayerChromium::updateLayerBackgroundColor()
+{
+    if (m_contentsLayer.isNull())
+        return;
+
+    // We never create the contents layer just for background color yet.
+    if (m_backgroundColorSet)
+        m_contentsLayer.setBackgroundColor(m_backgroundColor.rgb());
+    else
+        m_contentsLayer.setBackgroundColor(static_cast<RGBA32>(0));
+}
+
+void GraphicsLayerChromium::updateContentsVideo()
+{
+    // FIXME: Implement
+}
+
+void GraphicsLayerChromium::updateContentsRect()
+{
+    if (m_contentsLayer.isNull())
+        return;
+
+    m_contentsLayer.setPosition(FloatPoint(m_contentsRect.x(), m_contentsRect.y()));
+    m_contentsLayer.setBounds(IntSize(m_contentsRect.width(), m_contentsRect.height()));
+}
+
+void GraphicsLayerChromium::updateContentsScale()
+{
+    // If page scale is already applied then there's no need to apply it again.
+    if (appliesPageScale() || m_layer.isNull())
+        return;
+
+    m_layer.setContentsScale(contentsScale());
+}
+
+void GraphicsLayerChromium::setupContentsLayer(LayerChromium* contentsLayer)
+{
+    if (contentsLayer == m_contentsLayer.unwrap<LayerChromium>())
+        return;
+
+    if (!m_contentsLayer.isNull()) {
+        m_contentsLayer.setUseParentBackfaceVisibility(false);
+        m_contentsLayer.removeFromParent();
+        m_contentsLayer.reset();
+    }
+
+    if (contentsLayer) {
+        m_contentsLayer = WebLayer(contentsLayer);
+
+        m_contentsLayer.setAnchorPoint(FloatPoint(0, 0));
+        m_contentsLayer.setUseParentBackfaceVisibility(true);
+
+        // It is necessary to call setDrawsContent as soon as we receive the new contentsLayer, for
+        // the correctness of early exit conditions in setDrawsContent() and setContentsVisible().
+        m_contentsLayer.setDrawsContent(m_contentsVisible);
+
+        // Insert the content layer first. Video elements require this, because they have
+        // shadow content that must display in front of the video.
+        m_layer.insertChild(m_contentsLayer, 0);
+
+        if (showDebugBorders()) {
+            m_contentsLayer.setDebugBorderColor(Color(0, 0, 128, 180).rgb());
+            m_contentsLayer.setDebugBorderWidth(1);
+        }
+    }
+    updateDebugIndicators();
+    updateNames();
+}
+
+float GraphicsLayerChromium::contentsScale() const
+{
+    if (!appliesPageScale())
+        return pageScaleFactor() * deviceScaleFactor();
+    return 1;
+}
+
+void GraphicsLayerChromium::deviceOrPageScaleFactorChanged()
+{
+    updateContentsScale();
+    // Invalidations are clamped to the layer's bounds but we receive the scale changed notification before receiving
+    // the new layer bounds. When the scale changes, we really want to invalidate the post-scale layer bounds, so we
+    // remember that the scale has changed and then invalidate the full layer bounds when we receive the new size.
+    m_pageScaleChanged = true;
+}
+
+void GraphicsLayerChromium::paint(GraphicsContext& context, const IntRect& clip)
+{
+    context.platformContext()->setDrawingToImageBuffer(true);
+    paintGraphicsLayerContents(context, clip);
+}
+
+int GraphicsLayerChromium::mapAnimationNameToId(const String& animationName)
+{
+    if (animationName.isEmpty())
+        return 0;
+
+    if (!m_animationIdMap.contains(animationName))
+        m_animationIdMap.add(animationName, AnimationIdVendor::getNextAnimationId());
+
+    return m_animationIdMap.find(animationName)->second;
+}
+
+void GraphicsLayerChromium::notifyAnimationStarted(double startTime)
+{
+    if (m_client)
+        m_client->notifyAnimationStarted(this, startTime);
+}
+
+void GraphicsLayerChromium::notifyAnimationFinished(double)
+{
+    // Do nothing.
+}
+
+} // namespace WebCore
+
+#endif // USE(ACCELERATED_COMPOSITING)