Changes subtreeShouldRenderToSeparateSurface logic to account for explicit clipping

cc/layer.cc

 // Copyright 2010 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/layer.h"
 
 #include "cc/animation.h"
 #include "cc/animation_events.h"
 #include "cc/layer_animation_controller.h"
 #include "cc/layer_impl.h"
@@ skipping 111 matching lines @@
     // values x and y, ceil((x / y) * y) may be x + 1.
     contentRect.Intersect(gfx::Rect(gfx::Point(), contentBounds()));
     return gfx::ToEnclosingRect(contentRect);
 }
 
 bool Layer::blocksPendingCommit() const
 {
     return false;
 }
 
+bool Layer::canClipSelf() const
+{
+    return false;
+}
+
 void Layer::setParent(Layer* layer)
 {
     DCHECK(!layer || !layer->hasAncestor(this));
     m_parent = layer;
     setLayerTreeHost(m_parent ? m_parent->layerTreeHost() : 0);
 
     forceAutomaticRasterScaleToBeRecomputed();
 }
 
 bool Layer::hasAncestor(Layer* ancestor) const
@@ skipping 719 matching lines @@
 {
     return 0;
 }
 
 void sortLayers(std::vector<scoped_refptr<Layer> >::iterator, std::vector<scoped_refptr<Layer> >::iterator, void*)
 {
     // Currently we don't use z-order to decide what to paint, so there's no need to actually sort Layers.
 }
 
 }  // namespace cc