Update from https://crrev.com/312600

TBR=jamesr@chromium.org

Review URL: https://codereview.chromium.org/863253002
diff --git a/cc/test/fake_layer_tree_host_client.h b/cc/test/fake_layer_tree_host_client.h
index f256ab1..5f7afa5 100644
--- a/cc/test/fake_layer_tree_host_client.h
+++ b/cc/test/fake_layer_tree_host_client.h
@@ -50,6 +50,7 @@
   void DidCommit() override {}
   void DidCommitAndDrawFrame() override {}
   void DidCompleteSwapBuffers() override {}
+  void DidCompletePageScaleAnimation() override {}
 
   // LayerTreeHostSingleThreadClient implementation.
   void DidPostSwapBuffers() override {}