Revert of Added an extra sync token field for extra command buffer identification.

gpu/command_buffer/tests/gl_manager.cc

 // 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.
 
 #include "gpu/command_buffer/tests/gl_manager.h"
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 
@@ skipping 487 matching lines @@
 }
 
 gpu::CommandBufferNamespace GLManager::GetNamespaceID() const {
   return gpu::CommandBufferNamespace::IN_PROCESS;
 }
 
 uint64_t GLManager::GetCommandBufferID() const {
   return command_buffer_id_;
 }
 
-int32_t GLManager::GetExtraCommandBufferData() const {
-  return 0;
-}
-
 uint64_t GLManager::GenerateFenceSyncRelease() {
   return next_fence_sync_release_++;
 }
 
 bool GLManager::IsFenceSyncRelease(uint64_t release) {
   return release > 0 && release < next_fence_sync_release_;
 }
 
 bool GLManager::IsFenceSyncFlushed(uint64_t release) {
   return IsFenceSyncRelease(release);
 }
 
 bool GLManager::IsFenceSyncFlushReceived(uint64_t release) {
   return IsFenceSyncRelease(release);
 }
 
 void GLManager::SignalSyncToken(const gpu::SyncToken& sync_token,
                                 const base::Closure& callback) {
   NOTIMPLEMENTED();
 }
 
 bool GLManager::CanWaitUnverifiedSyncToken(const gpu::SyncToken* sync_token) {
   return false;
 }
 
 }  // namespace gpu