Turn off computation of the interest rect in cc in synchronized paint mode.

cc/trees/layer_tree_host_pixeltest_tiles.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/picture_layer.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/playback/display_item_list.h"
 #include "cc/playback/display_item_list_settings.h"
 #include "cc/playback/drawing_display_item.h"
@@ skipping 87 matching lines @@
   base::FilePath ref_file_;
   scoped_ptr<SkBitmap> result_bitmap_;
   RasterMode raster_mode_;
 };
 
 class BlueYellowClient : public ContentLayerClient {
  public:
   explicit BlueYellowClient(const gfx::Size& size)
       : size_(size), blue_top_(true) {}
 
+  gfx::Rect PaintableRegion() override { return gfx::Rect(size_); }
   scoped_refptr<DisplayItemList> PaintContentsToDisplayList(
       const gfx::Rect& clip,
       PaintingControlSetting painting_status) override {
     DisplayItemListSettings settings;
     settings.use_cached_picture = false;
     scoped_refptr<DisplayItemList> display_list =
         DisplayItemList::Create(clip, settings);
 
     SkPictureRecorder recorder;
     skia::RefPtr<SkCanvas> canvas = skia::SharePtr(
@@ skipping 118 matching lines @@
        FullRaster_SingleThread_GpuRaster) {
   RunRasterPixelTest(
       false, FULL_GPU, picture_layer_,
       base::FilePath(FILE_PATH_LITERAL("blue_yellow_flipped.png")));
 }
 
 }  // namespace
 }  // namespace cc
 
 #endif  // !defined(OS_ANDROID)