cc: Move gpu rasterization flag from LayerImpl to LayerTreeImpl.

cc/trees/layer_tree_impl.h

 // 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.
 
 #ifndef CC_TREES_LAYER_TREE_IMPL_H_
 #define CC_TREES_LAYER_TREE_IMPL_H_
 
 #include <list>
 #include <string>
 #include <vector>
@@ skipping 145 matching lines @@
   }
   float page_scale_factor() const { return page_scale_factor_; }
   float min_page_scale_factor() const { return min_page_scale_factor_; }
   float max_page_scale_factor() const { return max_page_scale_factor_; }
   float page_scale_delta() const  { return page_scale_delta_; }
   void set_sent_page_scale_delta(float delta) {
     sent_page_scale_delta_ = delta;
   }
   float sent_page_scale_delta() const { return sent_page_scale_delta_; }
 
+  void set_use_gpu_rasterization(bool use_gpu) {
+    use_gpu_rasterization_ = 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();
 
   void set_needs_update_draw_properties() {
     needs_update_draw_properties_ = true;
   }
   bool needs_update_draw_properties() const {
     return needs_update_draw_properties_;
   }
@@ skipping 99 matching lines @@
 
   std::vector<LayerImpl*> layers_with_copy_output_request_;
 
   // Persisted state for non-impl-side-painting.
   int scrolling_layer_id_from_previous_tree_;
 
   // List of visible or hit-testable layers for the most recently prepared
   // frame. Used for rendering and input event hit testing.
   LayerImplList render_surface_layer_list_;
 
+  bool use_gpu_rasterization_;
   bool contents_textures_purged_;
   bool requires_high_res_to_draw_;
   bool viewport_size_invalid_;
   bool needs_update_draw_properties_;
 
   // In impl-side painting mode, this is true when the tree may contain
   // structural differences relative to the active tree.
   bool needs_full_tree_sync_;
 
   bool next_activation_forces_redraw_;
 
   ScopedPtrVector<SwapPromise> swap_promise_list_;
 
   UIResourceRequestQueue ui_resource_request_queue_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_IMPL_H_