cc: Let skia veto gpu rasterization.

cc/layers/picture_layer_impl.h

Index: cc/layers/picture_layer_impl.h
diff --git a/cc/layers/picture_layer_impl.h b/cc/layers/picture_layer_impl.h
index b9a04eaf3bb509980ce27a2f5c71f079c756ebeb..dc171fc9605e1c231b5512dd9a6c353a2194eb85 100644
--- a/cc/layers/picture_layer_impl.h
+++ b/cc/layers/picture_layer_impl.h
@@ -129,8 +129,8 @@ class CC_EXPORT PictureLayerImpl
 
   virtual void RunMicroBenchmark(MicroBenchmarkImpl* benchmark) OVERRIDE;
 
-  void SetHasGpuRasterizationHint(bool has_hint);
-  bool ShouldUseGpuRasterization() const;
+  void SetUseGpuRasterization(bool use_gpu);
+  bool ShouldUseGpuRasterization() const { return use_gpu_rasterization_; }
 
   // Functions used by tile manager.
   void DidUnregisterLayer();
@@ -208,8 +208,8 @@ class CC_EXPORT PictureLayerImpl
   // A sanity state check to make sure UpdateTilePriorities only gets called
   // after a CalculateContentsScale/ManageTilings.
   bool should_update_tile_priorities_;
-  bool has_gpu_rasterization_hint_;
   bool should_use_low_res_tiling_;
+  bool use_gpu_rasterization_;
 
   bool layer_needs_to_register_itself_;