cc: Adding support for RGBA_4444 tile textures

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 44273c280d92a9b4053b979aaa318385343e32a5..9bd022d0a612fc679e9e2aea8adb9c32dfdb6e13 100644
--- a/cc/output/gl_renderer.h
+++ b/cc/output/gl_renderer.h
@@ -103,7 +103,7 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
   void GetFramebufferPixelsAsync(gfx::Rect rect,
                                  scoped_ptr<CopyOutputRequest> request);
   void GetFramebufferTexture(unsigned texture_id,
-                             unsigned texture_format,
+                             ResourceFormat texture_format,
                              gfx::Rect device_rect);
   void ReleaseRenderPassTextures();
 
@@ -455,6 +455,7 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
   scoped_refptr<ResourceProvider::Fence> last_swap_fence_;
 
   SkBitmap on_demand_tile_raster_bitmap_;
+  SkBitmap on_demand_tile_raster_bitmap_4444_;
   ResourceProvider::ResourceId on_demand_tile_raster_resource_id_;
 
   DISALLOW_COPY_AND_ASSIGN(GLRenderer);