Implement on demand quad rasterization for PicturePiles.

cc/gl_renderer.h

Index: cc/gl_renderer.h
diff --git a/cc/gl_renderer.h b/cc/gl_renderer.h
index 7b1f8f489e658237a1cce1751fe6691a56006081..5be02e60252dc62b58cb69aeae4c6037c735c2a1 100644
--- a/cc/gl_renderer.h
+++ b/cc/gl_renderer.h
@@ -23,6 +23,7 @@
 namespace cc {
 
 class OutputSurface;
+class PictureDrawQuad;
 class ScopedResource;
 class StreamVideoDrawQuad;
 class TextureDrawQuad;
@@ -137,6 +138,7 @@ class CC_EXPORT GLRenderer :
   void DrawTileQuad(const DrawingFrame& frame, const TileDrawQuad* quad);
   void DrawYUVVideoQuad(const DrawingFrame& frame,
                         const YUVVideoDrawQuad* quad);
+  void DrawPictureQuad(const DrawingFrame& frame, const PictureDrawQuad* quad);
 
   void SetShaderOpacity(float opacity, int alpha_location);
   void SetShaderQuadF(const gfx::QuadF& quad, int quad_location);
@@ -298,6 +300,10 @@ class CC_EXPORT GLRenderer :
 
   scoped_refptr<ResourceProvider::Fence> last_swap_fence_;
 
+  SkBitmap on_demand_tile_raster_bitmap_;
+  GLuint on_demand_tile_raster_texture_;
+  ResourceProvider::ResourceId on_demand_tile_raster_resource_id_;
+
   DISALLOW_COPY_AND_ASSIGN(GLRenderer);
 };