Tiling priorities in Android Webview.

cc/resources/picture_layer_tiling.h

Index: cc/resources/picture_layer_tiling.h
diff --git a/cc/resources/picture_layer_tiling.h b/cc/resources/picture_layer_tiling.h
index e0a368df236c962213582ecf6aa86b2ed27837e4..808d57586d30bf2e8e768ee7c26eecbedc7a025e 100644
--- a/cc/resources/picture_layer_tiling.h
+++ b/cc/resources/picture_layer_tiling.h
@@ -162,6 +162,10 @@ class CC_EXPORT PictureLayerTiling {
     return all_tiles;
   }
 
+  const gfx::Rect& GetCurrentVisibleRectForTesting() const {
+    return current_visible_rect_;
+  }
+
   // Iterate over all tiles to fill content_rect.  Even if tiles are invalid
   // (i.e. no valid resource) this tiling should still iterate over them.
   // The union of all geometry_rect calls for each element iterated over should