WIP: Plumbing input event latency reporting through Mus GPU.

gpu/command_buffer/client/context_support.h

Index: gpu/command_buffer/client/context_support.h
diff --git a/gpu/command_buffer/client/context_support.h b/gpu/command_buffer/client/context_support.h
index 53b33c8fee666baa1a9e594f003dd16e6a09d7ad..e4b9c4f21f682c34bbf4a00709927c328a494e95 100644
--- a/gpu/command_buffer/client/context_support.h
+++ b/gpu/command_buffer/client/context_support.h
@@ -16,6 +16,10 @@ class Rect;
 class RectF;
 }
 
+namespace ui {
+class LatencyInfo;
+}
+
 namespace gpu {
 
 struct SyncToken;
@@ -63,6 +67,11 @@ class ContextSupport {
   virtual void SetErrorMessageCallback(
       const base::Callback<void(const char*, int32_t)>& callback) = 0;
 
+  // Add |latency_info| to be reported and augumented with GPU latency
+  // components next time there is a GPU buffer swap.
+  virtual void AddLatencyInfo(
+      const std::vector<ui::LatencyInfo>& latency_info) = 0;
+
  protected:
   ContextSupport() {}
   virtual ~ContextSupport() {}