Blend TextureLayer background-color at draw time.

cc/output/gl_renderer_draw_cache.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_OUTPUT_GL_RENDERER_DRAW_CACHE_H_
 #define CC_OUTPUT_GL_RENDERER_DRAW_CACHE_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 17 matching lines @@
   TexturedQuadDrawCache();
   ~TexturedQuadDrawCache();
 
   // Values tracked to determine if textured quads may be coalesced.
   int program_id;
   int resource_id;
   bool needs_blending;
 
   // Information about the program binding that is required to draw.
   int uv_xform_location;
+  int background_color_location;
   int vertex_opacity_location;
   int matrix_location;
   int sampler_location;
 
   // A cache for the coalesced quad data.
   std::vector<Float4> uv_xform_data;
+  std::vector<Float4> background_color_data;
   std::vector<float> vertex_opacity_data;
   std::vector<Float16> matrix_data;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TexturedQuadDrawCache);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_GL_RENDERER_DRAW_CACHE_H_