Implement SkImageFilter support in the compositor.

cc/layer_tree_host_common.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 
 #include "CCLayerTreeHostCommon.h"
 
 #include "CCLayerImpl.h"
 #include "CCLayerIterator.h"
@@ skipping 224 matching lines @@
 
     // If the layer uses a mask.
     if (layer->maskLayer())
         return true;
 
     // If the layer has a reflection.
     if (layer->replicaLayer())
         return true;
 
     // If the layer uses a CSS filter.
-    if (!layer->filters().isEmpty() || !layer->backgroundFilters().isEmpty())
+    if (!layer->filters().isEmpty() || !layer->backgroundFilters().isEmpty() || layer->filter())
         return true;
 
     // If the layer flattens its subtree (i.e. the layer doesn't preserve-3d), but it is
     // treated as a 3D object by its parent (i.e. parent does preserve-3d).
     if (layerIsInExisting3DRenderingContext(layer) && !layer->preserves3D() && descendantDrawsContent)
         return true;
 
     // If the layer clips its descendants but it is not axis-aligned with respect to its parent.
     if (layerClipsSubtree(layer) && !axisAlignedWithRespectToParent && descendantDrawsContent)
         return true;
@@ skipping 313 matching lines @@
         if (layer->maskLayer()) {
             layer->maskLayer()->setRenderTarget(layer);
             layer->maskLayer()->setVisibleContentRect(IntRect(IntPoint(), layer->contentBounds()));
         }
 
         if (layer->replicaLayer() && layer->replicaLayer()->maskLayer()) {
             layer->replicaLayer()->maskLayer()->setRenderTarget(layer);
             layer->replicaLayer()->maskLayer()->setVisibleContentRect(IntRect(IntPoint(), layer->contentBounds()));
         }
 
-        if (layer->filters().hasFilterThatMovesPixels())
+        // FIXME:  make this smarter for the SkImageFilter case (check for
+        //         pixel-moving filters)
+        if (layer->filters().hasFilterThatMovesPixels() || layer->filter())
             nearestAncestorThatMovesPixels = renderSurface;
 
         // The render surface clipRect is expressed in the space where this surface draws, i.e. the same space as clipRectFromAncestor.
         if (ancestorClipsSubtree)
             renderSurface->setClipRect(clipRectFromAncestor);
         else
             renderSurface->setClipRect(IntRect());
 
         renderSurface->setNearestAncestorThatMovesPixels(nearestAncestorThatMovesPixels);
 
@@ skipping 265 matching lines @@
 
         foundLayer = currentLayer;
         break;
     }
 
     // This can potentially return 0, which means the screenSpacePoint did not successfully hit test any layers, not even the root layer.
     return foundLayer;
 }
 
 } // namespace cc