Add a flag to disable partial raster in renderer

cc/test/fake_picture_layer_tiling_client.h

Index: cc/test/fake_picture_layer_tiling_client.h
diff --git a/cc/test/fake_picture_layer_tiling_client.h b/cc/test/fake_picture_layer_tiling_client.h
index bce66489aa3b8373d2925cff388ea7a213afc032..6a3f98788beff195ce75644c31509958015efcc1 100644
--- a/cc/test/fake_picture_layer_tiling_client.h
+++ b/cc/test/fake_picture_layer_tiling_client.h
@@ -32,6 +32,7 @@ class FakePictureLayerTilingClient : public PictureLayerTilingClient {
   const PictureLayerTiling* GetPendingOrActiveTwinTiling(
       const PictureLayerTiling* tiling) const override;
   bool RequiresHighResToDraw() const override;
+  bool IsPartialRasterEnabled() const override;
 
   void set_twin_tiling_set(PictureLayerTilingSet* set) {
     twin_set_ = set;
@@ -46,6 +47,10 @@ class FakePictureLayerTilingClient : public PictureLayerTilingClient {
   void set_has_valid_tile_priorities(bool has_valid_tile_priorities) {
     has_valid_tile_priorities_ = has_valid_tile_priorities;
   }
+  void set_partial_raster_enabled(bool partial_raster_enabled) {
+    partial_raster_enabled_ = partial_raster_enabled;
+  }
+
   RasterSource* raster_source() { return raster_source_.get(); }
 
   TileManager* tile_manager() const {
@@ -63,6 +68,7 @@ class FakePictureLayerTilingClient : public PictureLayerTilingClient {
   gfx::Rect text_rect_;
   Region invalidation_;
   bool has_valid_tile_priorities_;
+  bool partial_raster_enabled_;
 };
 
 }  // namespace cc