gpu: GPU service scheduler.

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>
 
@@ skipping 51 matching lines @@
   // may not be supported with all implementations.
   virtual void SetLock(base::Lock*) = 0;
 
   // When this function returns it ensures all previously flushed work is
   // visible by the service. This command does this by sending a synchronous
   // IPC. Note just because the work is visible to the server does not mean
   // that it has been processed. This is only relevant for out of process
   // services and will be treated as a NOP for in process command buffers.
   virtual void EnsureWorkVisible() = 0;
 
+  virtual void EnsureWorkVisibleAsync() = 0;

[piman, 2017/05/09 00:48:38]

nit: please provide documentation here.
Not too sure about the naming. What it does really is flush the ordering
barriers, right? As is it sounds you would expect it to be like
EnsureWorkVisible but with a callback instead of synchronous.

[sunnyps, 2017/05/10 23:15:15]

Done.

+
   // The namespace and command buffer ID forms a unique pair for all existing
   // GpuControl (on client) and matches for the corresponding command buffer
   // (on server) in a single server process. The extra command buffer data can
   // be used for extra identification purposes. One usage is to store some
   // extra field to identify unverified sync tokens for the implementation of
   // the CanWaitUnverifiedSyncToken() function.
   virtual CommandBufferNamespace GetNamespaceID() const = 0;
   virtual CommandBufferId GetCommandBufferID() const = 0;
   virtual int32_t GetExtraCommandBufferData() const = 0;
 
@@ skipping 42 matching lines @@
   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_