[WIP] Implement BackGroundFilter as seperate layer in cc

cc/quads/draw_quad.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_QUADS_DRAW_QUAD_H_
 #define CC_QUADS_DRAW_QUAD_H_
 
 #include "base/callback.h"
 #include "cc/base/cc_export.h"
 #include "cc/quads/shared_quad_state.h"
@@ skipping 19 matching lines @@
 // e.g. the content space for TiledLayerImpls, or the geometry space for
 // PictureLayerImpls). There is also the "target space", which is the space, in
 // "physical" pixels, of the render target where the quads is drawn. The quad's
 // transform maps the content space to the target space.
 class CC_EXPORT DrawQuad {
  public:
   enum Material {
     INVALID,
     CHECKERBOARD,
     DEBUG_BORDER,
+    FILTER_CONTENT,
     IO_SURFACE_CONTENT,
     PICTURE_CONTENT,
     RENDER_PASS,
     SOLID_COLOR,
     STREAM_VIDEO_CONTENT,
     SURFACE_CONTENT,
     TEXTURE_CONTENT,
     TILED_CONTENT,
     YUV_VIDEO_CONTENT,
     MATERIAL_LAST = YUV_VIDEO_CONTENT
@@ skipping 86 matching lines @@
               const gfx::Rect& rect,
               const gfx::Rect& opaque_rect,
               const gfx::Rect& visible_rect,
               bool needs_blending);
   virtual void ExtendValue(base::debug::TracedValue* value) const = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_QUADS_DRAW_QUAD_H_