cc: Add image decode control in the compositor.

cc/tiles/tile_manager.h

Index: cc/tiles/tile_manager.h
diff --git a/cc/tiles/tile_manager.h b/cc/tiles/tile_manager.h
index 310b934950083220ac0bb0496054f0fc68b8e128..56c883154d0402a1720c2af7c4a84d0f80de5159 100644
--- a/cc/tiles/tile_manager.h
+++ b/cc/tiles/tile_manager.h
@@ -142,6 +142,10 @@ class CC_EXPORT TileManager : public TileTaskRunnerClient {
   bool IsReadyToActivate() const;
   bool IsReadyToDraw() const;
 
+  ImageDecodeController* GetImageDecodeController() {
+    return &image_decode_controller_;
+  }
+
   scoped_refptr<base::trace_event::ConvertableToTraceFormat> BasicStateAsValue()
       const;
   void BasicStateAsValueInto(base::trace_event::TracedValue* dict) const;
@@ -337,6 +341,8 @@ class CC_EXPORT TileManager : public TileTaskRunnerClient {
   uint64_t prepare_tiles_count_;
   uint64_t next_tile_id_;
 
+  base::hash_map<Tile::Id, std::vector<DrawImage>> scheduled_draw_images_;
+
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };