compositor-worker: cc->blink mutation plumbing

cc/test/layer_tree_test.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/test/layer_tree_test.h"
 
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 355 matching lines @@
   void ApplyViewportDeltas(const gfx::Vector2dF& inner_delta,
                            const gfx::Vector2dF& outer_delta,
                            const gfx::Vector2dF& elastic_overscroll_delta,
                            float page_scale,
                            float top_controls_delta) override {
     test_hooks_->ApplyViewportDeltas(inner_delta, outer_delta,
                                      elastic_overscroll_delta, page_scale,
                                      top_controls_delta);
   }
 
+  void ApplyMutations(const LayerTreeMutations& mutations) override {}
+
   void RequestNewOutputSurface() override {
     test_hooks_->RequestNewOutputSurface();
   }
 
   void DidInitializeOutputSurface() override {
     test_hooks_->DidInitializeOutputSurface();
   }
 
   void SendBeginFramesToChildren(const BeginFrameArgs& args) override {
     test_hooks_->SendBeginFramesToChildren(args);
@@ skipping 547 matching lines @@
       static_cast<ThreadedChannel*>(GetProxyMainForTest()->channel_main());
   ProxyImpl* proxy_impl = threaded_channel->GetProxyImplForTesting();
 
   // We check for null ProxyImpl since ProxyImpl exists in the ThreadedChannel
   // only after it is initialized.
   DCHECK(proxy_impl);
   return static_cast<ProxyImplForTest*>(proxy_impl);
 }
 
 }  // namespace cc