WIP: Plumbing input event latency reporting through Mus GPU.

gpu/gles2_conform_support/egl/context.h

Index: gpu/gles2_conform_support/egl/context.h
diff --git a/gpu/gles2_conform_support/egl/context.h b/gpu/gles2_conform_support/egl/context.h
index 7a9d43555d4e0cdfe07893aadae423fdbb97e22c..84f15c103d6e06562e7c8e6d5f67d7fa5f51aed0 100644
--- a/gpu/gles2_conform_support/egl/context.h
+++ b/gpu/gles2_conform_support/egl/context.h
@@ -78,6 +78,8 @@ class Context : public base::RefCountedThreadSafe<Context>,
                        const base::Closure& callback) override;
   void WaitSyncTokenHint(const gpu::SyncToken& sync_token) override;
   bool CanWaitUnverifiedSyncToken(const gpu::SyncToken& sync_token) override;
+  void AddLatencyInfo(
+      const std::vector<ui::LatencyInfo>& latency_info) override;
 
   // Called by ThreadState to set the needed global variables when this context
   // is current.