Add optimization for CHROMIUM_subscribe_uniform extension.

content/public/test/mock_render_process_host.h

Index: content/public/test/mock_render_process_host.h
diff --git a/content/public/test/mock_render_process_host.h b/content/public/test/mock_render_process_host.h
index 4e2cf8e9595a7a209f8a5a046ea8c676e0d36623..326f2af1a0e1ef4d4f6248fccf959e1506788126 100644
--- a/content/public/test/mock_render_process_host.h
+++ b/content/public/test/mock_render_process_host.h
@@ -83,6 +83,11 @@ class MockRenderProcessHost : public RenderProcessHost {
   void NotifyTimezoneChange() override;
   ServiceRegistry* GetServiceRegistry() override;
   const base::TimeTicks& GetInitTimeForNavigationMetrics() const override;
+  bool SubscribeUniformEnabled() const override;
+  void OnAddSubscription(unsigned int target) override;
+  void OnRemoveSubscription(unsigned int target) override;
+  void SendUpdateValueState(
+      unsigned int target, const gpu::ValueState& state) override;
 
   // IPC::Sender via RenderProcessHost.
   bool Send(IPC::Message* msg) override;