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

gpu/gles2_conform_support/egl/display.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/gles2_conform_support/egl/display.h"
 
 #include <vector>
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 327 matching lines @@
 }
 
 gpu::CommandBufferNamespace Display::GetNamespaceID() const {
   return gpu::CommandBufferNamespace::IN_PROCESS;
 }
 
 uint64_t Display::GetCommandBufferID() const {
   return 0;
 }
 
-int32_t Display::GetExtraCommandBufferData() const {
-  return 0;
-}
-
 uint64_t Display::GenerateFenceSyncRelease() {
   return next_fence_sync_release_++;
 }
 
 bool Display::IsFenceSyncRelease(uint64_t release) {
   return release > 0 && release < next_fence_sync_release_;
 }
 
 bool Display::IsFenceSyncFlushed(uint64_t release) {
   return IsFenceSyncRelease(release);
 }
 
 bool Display::IsFenceSyncFlushReceived(uint64_t release) {
   return IsFenceSyncRelease(release);
 }
 
 void Display::SignalSyncToken(const gpu::SyncToken& sync_token,
                               const base::Closure& callback) {
   NOTIMPLEMENTED();
 }
 
 bool Display::CanWaitUnverifiedSyncToken(const gpu::SyncToken* sync_token) {
   return false;
 }
 
 }  // namespace egl