cc: Add PictureLayerTiling for 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/picture_layer_impl.h"
 #include "ui/gfx/rect_conversions.h"
 
 namespace cc {
 
@@ skipping 13 matching lines @@
 }
 
 scoped_ptr<LayerImpl> PictureLayer::createLayerImpl() {
   return PictureLayerImpl::create(id()).PassAs<LayerImpl>();
 }
 
 void PictureLayer::pushPropertiesTo(LayerImpl* base_layer) {
   PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
   pile_.PushPropertiesTo(layer_impl->pile_);
 
+  // TODO(enne): Need to sync tiling from active tree prior to this?
   // TODO(nduca): Need to invalidate tiles here from pile's invalidation info.
 }
 
 void PictureLayer::setNeedsDisplayRect(const gfx::RectF& layer_rect) {
   gfx::Rect rect = gfx::ToEnclosedRect(layer_rect);
   pile_.Invalidate(rect);
 }
 
 void PictureLayer::update(ResourceUpdateQueue&, const OcclusionTracker*,
                     RenderingStats& stats) {
   pile_.Resize(bounds());
   pile_.Update(client_, stats);
 }
 
 }  // namespace cc