Hide fullscreen rotation jank

cc/test/fake_proxy.h

Index: cc/test/fake_proxy.h
diff --git a/cc/test/fake_proxy.h b/cc/test/fake_proxy.h
index c279c34ce324f7d5cea4cf8e6d7f8a207815b6d3..c188a314ff394e3fca91203ed0bfd9f73fbd32ad 100644
--- a/cc/test/fake_proxy.h
+++ b/cc/test/fake_proxy.h
@@ -23,6 +23,7 @@ class FakeProxy : public Proxy {
       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 {}