WIP: Plumbing input event latency reporting through Mus GPU.

cc/output/in_process_context_provider.h

Index: cc/output/in_process_context_provider.h
diff --git a/cc/output/in_process_context_provider.h b/cc/output/in_process_context_provider.h
index 0a355d28de1f955b2f45e8b65766647bd59e43e6..46b06b52f1835819b56deb6b161b53e328e507d7 100644
--- a/cc/output/in_process_context_provider.h
+++ b/cc/output/in_process_context_provider.h
@@ -44,6 +44,7 @@ class CC_EXPORT InProcessContextProvider
       const gpu::SharedMemoryLimits& limits,
       InProcessContextProvider* shared_context);
 
+  // ContextProvider:
   bool BindToCurrentThread() override;
   gpu::gles2::GLES2Interface* ContextGL() override;
   gpu::ContextSupport* ContextSupport() override;
@@ -65,6 +66,8 @@ class CC_EXPORT InProcessContextProvider
       const gpu::InProcessCommandBuffer::UpdateVSyncParametersCallback&
           callback);
 
+  void SetLatencyInfo(const std::vector<ui::LatencyInfo>& latency_info);
+
  protected:
   friend class base::RefCountedThreadSafe<InProcessContextProvider>;
   ~InProcessContextProvider() override;