cc: Do solid color analysis before scheduling tiles.

cc/tiles/tile.h

Index: cc/tiles/tile.h
diff --git a/cc/tiles/tile.h b/cc/tiles/tile.h
index e245e0111d9ffa3fb26ed09e560d4e1d006eee41..00023a4fb9fd14ec6adf379dc94e448d02dd5beb 100644
--- a/cc/tiles/tile.h
+++ b/cc/tiles/tile.h
@@ -100,6 +100,8 @@ class CC_EXPORT Tile {
     return invalidated_content_rect_;
   }
 
+  bool HasRasterTask() const { return !!raster_task_.get(); }
+
  private:
   friend class TileManager;
   friend class FakeTileManager;
@@ -113,8 +115,6 @@ class CC_EXPORT Tile {
        int flags);
   ~Tile();
 
-  bool HasRasterTask() const { return !!raster_task_.get(); }
-
   TileManager* const tile_manager_;
   const gfx::Rect content_rect_;
   const gfx::Rect enclosing_layer_rect_;