cc: Support mask layers in impl-side painting

cc/picture_layer.cc

 // Copyright 2012 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 "cc/picture_layer.h"
 
 #include "cc/layer_tree_impl.h"
 #include "cc/picture_layer_impl.h"
 #include "ui/gfx/rect_conversions.h"
 
 namespace cc {
 
 scoped_refptr<PictureLayer> PictureLayer::create(ContentLayerClient* client) {
   return make_scoped_refptr(new PictureLayer(client));
 }
 
 PictureLayer::PictureLayer(ContentLayerClient* client) :
-  client_(client) {
+  client_(client),
+  is_mask_(false) {
 }
 
 PictureLayer::~PictureLayer() {
 }
 
 bool PictureLayer::drawsContent() const {
   return Layer::drawsContent() && client_;
 }
 
 scoped_ptr<LayerImpl> PictureLayer::createLayerImpl(LayerTreeImpl* treeImpl) {
   return PictureLayerImpl::create(treeImpl, id()).PassAs<LayerImpl>();
 }
 
 void PictureLayer::pushPropertiesTo(LayerImpl* base_layer) {
   Layer::pushPropertiesTo(base_layer);
 
   PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
+  layer_impl->SetIsMask(is_mask_);
   layer_impl->tilings_.SetLayerBounds(bounds());
   layer_impl->invalidation_.Clear();
   layer_impl->invalidation_.Swap(pile_invalidation_);
   pile_.PushPropertiesTo(layer_impl->pile_);
 
   layer_impl->SyncFromActiveLayer();
 }
 
 void PictureLayer::setNeedsDisplayRect(const gfx::RectF& layer_rect) {
   gfx::Rect rect = gfx::ToEnclosedRect(layer_rect);
   pending_invalidation_.Union(rect);
   Layer::setNeedsDisplayRect(layer_rect);
 }
 
 void PictureLayer::update(ResourceUpdateQueue&, const OcclusionTracker*,
                     RenderingStats& stats) {
   if (pile_.size() == bounds() && pending_invalidation_.IsEmpty())
     return;
 
   pile_.Resize(bounds());
 
   // Calling paint in WebKit can sometimes cause invalidations, so save
   // off the invalidation prior to calling update.
   pile_invalidation_.Swap(pending_invalidation_);
   pending_invalidation_.Clear();
 
   pile_.Update(client_, pile_invalidation_, stats);
 }
 
+void PictureLayer::setIsMask(bool is_mask) {
+  is_mask_ = is_mask;
+}
+
 }  // namespace cc