cc:: Add remote mode to the compositor

cc/test/test_hooks.h

Index: cc/test/test_hooks.h
diff --git a/cc/test/test_hooks.h b/cc/test/test_hooks.h
index 8caec7f8f774aea41220233a0e16708ee7385bd5..30ebece07227369e63abdf8792e13857c3b6da9f 100644
--- a/cc/test/test_hooks.h
+++ b/cc/test/test_hooks.h
@@ -12,6 +12,10 @@
 
 namespace cc {
 
+namespace proto {
+class CompositorMessageToImpl;
+}
+
 // Used by test stubs to notify the test when something interesting happens.
 class TestHooks : public AnimationDelegate {
  public:
@@ -135,6 +139,15 @@ class TestHooks : public AnimationDelegate {
                               int group) override {}
 
   virtual void RequestNewOutputSurface() = 0;
+
+  // Used to notify the test to create the Remote client LayerTreeHost on
+  // receiving a CompositorMessageToImpl of type INITIALIZE_IMPL.
+  virtual void CreateRemoteClientHost(
+      const proto::CompositorMessageToImpl& proto) {}
+
+  // Used to notify the test to destroy the Remote client LayerTreeHost on
+  // receiving a CompositorMessageToImpl of type CLOSE_IMPL.
+  virtual void DestroyRemoteClientHost() {}
 };
 
 }  // namespace cc