cc: Move gpu rasterization flag from LayerImpl to LayerTreeImpl.

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 b559e3d491af7ae4246907b22d6487759cc388bb..e82bdb10950963079ab2bc45e3b12548a28e4f58 100644
--- a/cc/layers/picture_layer_impl.h
+++ b/cc/layers/picture_layer_impl.h
@@ -131,8 +131,7 @@ class CC_EXPORT PictureLayerImpl
 
   virtual void RunMicroBenchmark(MicroBenchmarkImpl* benchmark) OVERRIDE;
 
-  void SetUseGpuRasterization(bool use_gpu);
-  bool ShouldUseGpuRasterization() const { return use_gpu_rasterization_; }
+  bool UseGpuRasterization() const;

[reveman, 2014/05/08 21:51:30]

should we just get rid of this completely and use
layer_tree_impl()->use_gpu_rasterization() directly? I think that makes it more
clear that it's a tree specific setting and never different between layers.

[alokp, 2014/05/08 22:44:41]

I will prefer to keep this convenience function for now. It is used at multiple
places, some of which will go away once we can switch out the rasterizer.

[reveman, 2014/05/08 23:08:33]

Ok in that case, could it be inlined and named use_gpu_rasterization?

[alokp, 2014/05/08 23:34:43]

Done.

 
   // Functions used by tile manager.
   void DidUnregisterLayer();
@@ -151,7 +150,7 @@ class CC_EXPORT PictureLayerImpl
   void ManageTilings(bool animating_transform_to_screen,
                      float maximum_animation_contents_scale);
   bool ShouldHaveLowResTiling() const {
-    return should_use_low_res_tiling_ && !ShouldUseGpuRasterization();
+    return should_use_low_res_tiling_ && !UseGpuRasterization();
   }
   virtual bool ShouldAdjustRasterScale(
       bool animating_transform_to_screen) const;
@@ -212,7 +211,6 @@ class CC_EXPORT PictureLayerImpl
   // after a CalculateContentsScale/ManageTilings.
   bool should_update_tile_priorities_;
   bool should_use_low_res_tiling_;
-  bool use_gpu_rasterization_;
 
   bool layer_needs_to_register_itself_;