Add a flag to disable partial raster in renderer

cc/test/fake_picture_layer_tiling_client.cc

 // Copyright 2012 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/test/fake_picture_layer_tiling_client.h"
 
 #include <limits>
 
 #include "base/thread_task_runner_handle.h"
 #include "cc/test/fake_display_list_raster_source.h"
 #include "cc/test/fake_tile_manager.h"
 
 namespace cc {
 
 FakePictureLayerTilingClient::FakePictureLayerTilingClient()
     : tile_manager_(new FakeTileManager(&tile_manager_client_)),
       raster_source_(FakeDisplayListRasterSource::CreateInfiniteFilled()),
       twin_set_(nullptr),
       twin_tiling_(nullptr),
-      has_valid_tile_priorities_(true) {}
+      has_valid_tile_priorities_(true),
+      partial_raster_enabled_(false) {}
 
 FakePictureLayerTilingClient::FakePictureLayerTilingClient(
     ResourceProvider* resource_provider)
     : resource_pool_(
           ResourcePool::Create(resource_provider,
                                base::ThreadTaskRunnerHandle::Get().get(),
                                GL_TEXTURE_2D)),
       tile_manager_(
           new FakeTileManager(&tile_manager_client_, resource_pool_.get())),
       raster_source_(FakeDisplayListRasterSource::CreateInfiniteFilled()),
       twin_set_(nullptr),
       twin_tiling_(nullptr),
-      has_valid_tile_priorities_(true) {}
+      has_valid_tile_priorities_(true),
+      partial_raster_enabled_(false) {}
 
 FakePictureLayerTilingClient::~FakePictureLayerTilingClient() {
 }
 
 ScopedTilePtr FakePictureLayerTilingClient::CreateTile(
     const Tile::CreateInfo& info) {
   return tile_manager_->CreateTile(info, 0, 0, 0);
 }
 
 void FakePictureLayerTilingClient::SetTileSize(const gfx::Size& tile_size) {
@@ skipping 22 matching lines @@
     if (twin_set_->tiling_at(i)->contents_scale() == tiling->contents_scale())
       return twin_set_->tiling_at(i);
   }
   return nullptr;
 }
 
 bool FakePictureLayerTilingClient::RequiresHighResToDraw() const {
   return false;
 }
 
+bool FakePictureLayerTilingClient::IsPartialRasterEnabled() const {
+  return partial_raster_enabled_;
+}
+
 }  // namespace cc