cc: Force a redraw on initializing a new output surface for remote compositor.

cc/test/layer_tree_test.h

Index: cc/test/layer_tree_test.h
diff --git a/cc/test/layer_tree_test.h b/cc/test/layer_tree_test.h
index b3966303a15e404e24d31fb2ca21c94c661f0484..5641357d3864468cf1087a9b85abd73c3272c5f8 100644
--- a/cc/test/layer_tree_test.h
+++ b/cc/test/layer_tree_test.h
@@ -146,6 +146,7 @@ class LayerTreeTest : public testing::Test, public TestHooks {
   bool TestEnded() const { return ended_; }
 
   LayerTreeHost* layer_tree_host();
+  LayerTreeHost* remote_client_layer_tree_host();
   bool delegating_renderer() const { return delegating_renderer_; }
   FakeOutputSurface* output_surface() { return output_surface_; }