mix-blend-mode implementation for accelerated layers

cc/layers/render_surface_impl.h

 // Copyright 2011 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_LAYERS_RENDER_SURFACE_IMPL_H_
 #define CC_LAYERS_RENDER_SURFACE_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 28 matching lines @@
     return gfx::RectF(content_rect_).CenterPoint();
   }
 
   // Returns the rect that encloses the RenderSurfaceImpl including any
   // reflection.
   gfx::RectF DrawableContentRect() const;
 
   void SetDrawOpacity(float opacity) { draw_opacity_ = opacity; }
   float draw_opacity() const { return draw_opacity_; }
 
+  void SetHasBlendMode(bool has_blend_mode) {
+    has_blend_mode_ = has_blend_mode;
+  }
+  bool has_blend_mode() const { return has_blend_mode_; }
+
   void SetNearestAncestorThatMovesPixels(RenderSurfaceImpl* surface) {
     nearest_ancestor_that_moves_pixels_ = surface;
   }
   const RenderSurfaceImpl* nearest_ancestor_that_moves_pixels() const {
     return nearest_ancestor_that_moves_pixels_;
   }
 
   void SetDrawOpacityIsAnimating(bool draw_opacity_is_animating) {
     draw_opacity_is_animating_ = draw_opacity_is_animating;
   }
@@ skipping 83 matching lines @@
 
  private:
   LayerImpl* owning_layer_;
 
   // Uses this surface's space.
   gfx::Rect content_rect_;
   bool surface_property_changed_;
 
   float draw_opacity_;
   bool draw_opacity_is_animating_;
+  bool has_blend_mode_;
   gfx::Transform draw_transform_;
   gfx::Transform screen_space_transform_;
   gfx::Transform replica_draw_transform_;
   gfx::Transform replica_screen_space_transform_;
   bool target_surface_transforms_are_animating_;
   bool screen_space_transforms_are_animating_;
 
   bool is_clipped_;
   bool contributes_to_drawn_surface_;
 
@@ skipping 15 matching lines @@
   int target_render_surface_layer_index_history_;
   int current_layer_index_history_;
 
   friend struct LayerIteratorActions;
 
   DISALLOW_COPY_AND_ASSIGN(RenderSurfaceImpl);
 };
 
 }  // namespace cc
 #endif  // CC_LAYERS_RENDER_SURFACE_IMPL_H_