cc: Clean up RecordingSource API

cc/trees/layer_tree_host_unittest_serialization.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/trees/layer_tree_host.h"
 
 #include <memory>
 
 #include "base/memory/ptr_util.h"
 #include "cc/layers/empty_content_layer_client.h"
@@ skipping 363 matching lines @@
     PictureLayer* picture_layer_dst = reinterpret_cast<PictureLayer*>(
         layer_tree_host_dst_->root_layer()->child_at(0));
 
     RecordingSource* recording_source_src =
         picture_layer_src->GetRecordingSourceForTesting();
     RecordingSource* recording_source_dst =
         picture_layer_dst->GetRecordingSourceForTesting();
     EXPECT_EQ(recording_source_src->GetSize(), recording_source_dst->GetSize());
     EXPECT_TRUE(AreDisplayListDrawingResultsSame(
         gfx::Rect(recording_source_src->GetSize()),
-        recording_source_src->GetDisplayItemList(),
-        recording_source_dst->GetDisplayItemList()));
+        picture_layer_src->GetDisplayItemList(),
+        picture_layer_dst->GetDisplayItemList()));
 
     VerifySerializationAndDeserialization();
   }
 
   void RunAddAndRemoveNodeFromLayerTree() {
     /* Testing serialization when the tree hierarchy changes like this:
          root                  root
         /    \                /    \
        a      b        =>    a      c
                \                     \
@@ skipping 50 matching lines @@
 
 TEST_F(LayerTreeHostSerializationTest, AddAndRemoveNodeFromLayerTree) {
   RunAddAndRemoveNodeFromLayerTree();
 }
 
 TEST_F(LayerTreeHostSerializationTest, PictureLayerMultipleSerializations) {
   RunPictureLayerMultipleSerializationsTest();
 }
 
 }  // namespace cc