Move InsertSyncPoint to GLES2Interface

gpu/command_buffer/common/command_buffer.h

 // Copyright (c) 2012 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_COMMON_COMMAND_BUFFER_H_
 #define GPU_COMMAND_BUFFER_COMMON_COMMAND_BUFFER_H_
 
 #include "../../gpu_export.h"
 #include "../common/buffer.h"
 #include "../common/constants.h"
@@ skipping 123 matching lines @@
 // GetLastError declared would mean we'd have to also define it, and pull more
 // of gpu in to the NaCl Win64 build.
 #if !defined(NACL_WIN64)
   // TODO(apatrick): this is a temporary optimization while skia is calling
   // RendererGLContext::MakeCurrent prior to every GL call. It saves returning 6
   // ints redundantly when only the error is needed for the CommandBufferProxy
   // implementation.
   virtual error::Error GetLastError();
 #endif
 
+  // Inserts a sync point, returning its ID. Sync point IDs are global and can
+  // be used for cross-context synchronization.
+  virtual uint32 InsertSyncPoint() = 0;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(CommandBuffer);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_COMMON_COMMAND_BUFFER_H_