Optimize render passes with single quads

cc/output/gl_renderer.h

Index: cc/output/gl_renderer.h
diff --git a/cc/output/gl_renderer.h b/cc/output/gl_renderer.h
index 5a74c08d3a9d251d933f64799d5d50fa9b9163a3..6df1fdf041075baa9143bc1691df12be4d6e6547 100644
--- a/cc/output/gl_renderer.h
+++ b/cc/output/gl_renderer.h
@@ -177,9 +177,16 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
                                         ScopedResource* background_texture,
                                         const gfx::RectF& rect);
 
+  const TileDrawQuad* CanPassBeDrawnDirectly(const RenderPass* pass) override;
+
   void DrawRenderPassQuad(DrawingFrame* frame,
                           const RenderPassDrawQuad* quadi,
                           const gfx::QuadF* clip_region);
+  void DrawRenderPassQuadInternal(DrawingFrame* frame,
+                                  const RenderPassDrawQuad* quad,
+                                  const gfx::QuadF* clip_region,
+                                  const Resource* contents_texture,
+                                  bool is_render_pass_input);
   void DrawSolidColorQuad(const DrawingFrame* frame,
                           const SolidColorDrawQuad* quad,
                           const gfx::QuadF* clip_region);