Add a flag to disable partial raster in renderer

cc/layers/picture_layer_impl.h

Index: cc/layers/picture_layer_impl.h
diff --git a/cc/layers/picture_layer_impl.h b/cc/layers/picture_layer_impl.h
index 409afaeb9ca61d369bf70cdec6ef038c7202f08a..f6ecf3fa384b4d1e3d5267641e6799d6430f84d3 100644
--- a/cc/layers/picture_layer_impl.h
+++ b/cc/layers/picture_layer_impl.h
@@ -52,6 +52,7 @@ class CC_EXPORT PictureLayerImpl
   void RecreateResources() override;
   skia::RefPtr<SkPicture> GetPicture() override;
   Region GetInvalidationRegion() override;
+  gfx::Rect GetEnclosingRectInTargetSpace() const override;
 
   // PictureLayerTilingClient overrides.
   ScopedTilePtr CreateTile(const Tile::CreateInfo& info) override;
@@ -61,7 +62,7 @@ class CC_EXPORT PictureLayerImpl
       const PictureLayerTiling* tiling) const override;
   bool HasValidTilePriorities() const override;
   bool RequiresHighResToDraw() const override;
-  gfx::Rect GetEnclosingRectInTargetSpace() const override;
+  bool IsPartialRasterEnabled() const override;
 
   void set_gpu_raster_max_texture_size(gfx::Size gpu_raster_max_texture_size) {
     gpu_raster_max_texture_size_ = gpu_raster_max_texture_size;