cc: Move gpu rasterization flag from tree-impl to tree-host-impl.

cc/trees/layer_tree_impl.h

Index: cc/trees/layer_tree_impl.h
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index d27e1e4a073908385a8ab3b7c9d82147145daed6..e641bc2be9555123772b914125995bfcbb777cab 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -88,6 +88,7 @@ class CC_EXPORT LayerTreeImpl {
   scoped_ptr<ScrollbarAnimationController> CreateScrollbarAnimationController(
       LayerImpl* scrolling_layer);
   void DidAnimateScrollOffset();
+  bool use_gpu_rasterization() const;
 
   // Tree specific methods exposed to layer-impl tree.
   // ---------------------------------------------------------------------------
@@ -164,9 +165,6 @@ class CC_EXPORT LayerTreeImpl {
   }
   float sent_page_scale_delta() const { return sent_page_scale_delta_; }
 
-  void SetUseGpuRasterization(bool use_gpu);
-  bool use_gpu_rasterization() const { return use_gpu_rasterization_; }
-
   // Updates draw properties and render surface layer list, as well as tile
   // priorities.
   void UpdateDrawProperties();