WIP: Plumbing input event latency reporting through Mus GPU.

gpu/command_buffer/client/gpu_control.h

Index: gpu/command_buffer/client/gpu_control.h
diff --git a/gpu/command_buffer/client/gpu_control.h b/gpu/command_buffer/client/gpu_control.h
index 519712edc4af501b55fda1febd8b377be454fcbf..b98d79c8527f4de97490f42fa6868c56ea11e265 100644
--- a/gpu/command_buffer/client/gpu_control.h
+++ b/gpu/command_buffer/client/gpu_control.h
@@ -24,6 +24,10 @@ namespace base {
 class Lock;
 }
 
+namespace ui {
+class LatencyInfo;
+}
+
 namespace gpu {
 class GpuControlClient;
 struct SyncToken;
@@ -115,6 +119,11 @@ class GPU_EXPORT GpuControl {
   // first so does not need to be flushed.
   virtual bool CanWaitUnverifiedSyncToken(const SyncToken& sync_token) = 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;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(GpuControl);
 };