Hide fullscreen rotation jank

cc/test/fake_proxy.h

 // 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.
 
 #ifndef CC_TEST_FAKE_PROXY_H_
 #define CC_TEST_FAKE_PROXY_H_
 
 #include "base/single_thread_task_runner.h"
 #include "cc/trees/layer_tree_host.h"
 #include "cc/trees/proxy.h"
 
 namespace cc {
 
 class FakeProxy : public Proxy {
  public:
   FakeProxy() : layer_tree_host_(nullptr) {}
 
   void SetLayerTreeHost(LayerTreeHost* host);
 
   bool IsStarted() const override;
   bool CommitToActiveTree() const override;
   void SetCompositorFrameSink(
       CompositorFrameSink* compositor_frame_sink) override {}
   void ReleaseCompositorFrameSink() override;
   void SetVisible(bool visible) override {}
+  void SetIsFullscreen(bool is_fullscreen) override {}
   void SetNeedsAnimate() override {}
   void SetNeedsUpdateLayers() override {}
   void SetNeedsCommit() override {}
   void SetNeedsRedraw(const gfx::Rect& damage_rect) override {}
   void SetNextCommitWaitsForActivation() override {}
   void NotifyInputThrottledUntilCommit() override {}
   void SetDeferCommits(bool defer_commits) override {}
   void MainThreadHasStoppedFlinging() override {}
   bool CommitRequested() const override;
   void Start() override {}
   void Stop() override {}
   void SetMutator(std::unique_ptr<LayerTreeMutator> mutator) override;
   bool SupportsImplScrolling() const override;
   bool MainFrameWillHappenForTesting() override;
   void UpdateBrowserControlsState(BrowserControlsState constraints,
                                   BrowserControlsState current,
                                   bool animate) override {}
 
  private:
   LayerTreeHost* layer_tree_host_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_PROXY_H_