Add serialization/deserialization for FakePictureLayer for testing.

cc/trees/layer_tree_host_unittest.cc

 // Copyright 2011 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 <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 269 matching lines @@
     EXPECT_TRUE(all_tiles_required_for_activation_are_ready_to_draw_);
     EXPECT_LE(size_t(1), required_for_activation_count_);
   }
 
  private:
   FakeContentLayerClient client_;
 };
 
 // No single thread test because the commit goes directly to the active tree in
 // single thread mode, so notify ready to activate is skipped.
-// No remote test because we currently don't deserialize FakePictureLayer,
-// so on the impl side, PictureLayerImpl is created instead of
-// FakePictureLayerImpl, see crbug/657871.
-MULTI_THREAD_TEST_F(LayerTreeHostTestReadyToActivateNonEmpty);
+REMOTE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestReadyToActivateNonEmpty);
 
 // Test if the LTHI receives ReadyToDraw notifications from the TileManager when
 // no raster tasks get scheduled.
 class LayerTreeHostTestReadyToDrawEmpty : public LayerTreeHostTest {
  public:
   LayerTreeHostTestReadyToDrawEmpty()
       : did_notify_ready_to_draw_(false),
         all_tiles_required_for_draw_are_ready_to_draw_(false),
         required_for_draw_count_(0) {}
 
@@ skipping 6736 matching lines @@
     EndTest();
   }
 
   void AfterTest() override {}
 };
 
 SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostTestSubmitFrameResources);
 
 }  // namespace
 }  // namespace cc