Serialize DisplayListRecordingSource to protos.

cc/playback/display_item_list_unittest.cc

 // Copyright 2014 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/playback/display_item_list.h"
 
 #include <vector>
 
 #include "cc/output/filter_operation.h"
 #include "cc/output/filter_operations.h"
@@ skipping 64 matching lines @@
 void ValidateDisplayItemListSerialization(const gfx::Size& layer_size,
                                           scoped_refptr<DisplayItemList> list) {
   list->Finalize();
 
   // Serialize and deserialize the DisplayItemList.
   proto::DisplayItemList proto;
   list->ToProtobuf(&proto);
   scoped_refptr<DisplayItemList> new_list =
       DisplayItemList::CreateFromProto(proto);
 
-  // Finalize the DisplayItemLists to perform raster.
-  new_list->Finalize();
-
-  const int pixel_size = 4 * layer_size.GetArea();
-
-  // Get the rendered contents of the old DisplayItemList.
-  scoped_ptr<unsigned char[]> pixels(new unsigned char[pixel_size]);
-  memset(pixels.get(), 0, pixel_size);
-  DrawDisplayList(pixels.get(), gfx::Rect(layer_size), list);
-
-  // Get the rendered contents of the new DisplayItemList.
-  scoped_ptr<unsigned char[]> new_pixels(new unsigned char[pixel_size]);
-  memset(new_pixels.get(), 0, pixel_size);
-  DrawDisplayList(new_pixels.get(), gfx::Rect(layer_size), new_list);
-
-  EXPECT_EQ(0, memcmp(pixels.get(), new_pixels.get(), pixel_size));
+  EXPECT_TRUE(
+      AreDisplayListDrawingResultsSame(gfx::Rect(layer_size), list, new_list));
 }
 
 }  // namespace
 
 TEST(DisplayItemListTest, SerializeDisplayItemListSettings) {
   DisplayItemListSettings settings;
   settings.use_cached_picture = false;
 
   {
     proto::DisplayItemListSettings proto;
@@ skipping 556 matching lines @@
   // picture and items are retained (currently this only happens due to certain
   // categories being traced).
   list = new DisplayItemList(layer_rect, caching_settings, true);
   list->CreateAndAppendItem<DrawingDisplayItem>(kVisualRect, picture);
   list->Finalize();
   memory_usage = list->ApproximateMemoryUsage();
   EXPECT_EQ(static_cast<size_t>(0), memory_usage);
 }
 
 }  // namespace cc