WIP: Plumbing input event latency reporting through Mus GPU.

gpu/command_buffer/client/gpu_control.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_GPU_CONTROL_H_
 #define GPU_COMMAND_BUFFER_CLIENT_GPU_CONTROL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "gpu/command_buffer/common/capabilities.h"
 #include "gpu/command_buffer/common/command_buffer_id.h"
 #include "gpu/command_buffer/common/constants.h"
 #include "gpu/command_buffer/common/mailbox.h"
 #include "gpu/gpu_export.h"
 
 extern "C" typedef struct _ClientBuffer* ClientBuffer;
 
 namespace base {
 class Lock;
 }
 
+namespace ui {
+class LatencyInfo;
+}
+
 namespace gpu {
 class GpuControlClient;
 struct SyncToken;
 
 // Common interface for GpuControl implementations.
 class GPU_EXPORT GpuControl {
  public:
   GpuControl() {}
   virtual ~GpuControl() {}
 
@@ skipping 71 matching lines @@
   // example, the WaitSyncToken command is used to pull texture updates when
   // used in conjunction with MailboxManagerSync.
   virtual void WaitSyncTokenHint(const SyncToken& sync_token) = 0;
 
   // Under some circumstances a sync token may be used which has not been
   // verified to have been flushed. For example, fence syncs queued on the same
   // channel as the wait command guarantee that the fence sync will be enqueued
   // 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);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GPU_CONTROL_H_