Update from https://crrev.com/315085

mojo/gles2/command_buffer_client_impl.cc

 // 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.
 
 #include "mojo/gles2/command_buffer_client_impl.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "base/process/process_handle.h"
@@ skipping 162 matching lines @@
 }
 
 void CommandBufferClientImpl::Flush(int32 put_offset) {
   if (last_put_offset_ == put_offset)
     return;
 
   last_put_offset_ = put_offset;
   command_buffer_->Flush(put_offset);
 }
 
+void CommandBufferClientImpl::OrderingBarrier(int32_t put_offset) {
+  // TODO(jamesr): Implement this more efficiently.
+  Flush(put_offset);
+}
+
 void CommandBufferClientImpl::WaitForTokenInRange(int32 start, int32 end) {
   TryUpdateState();
   while (!InRange(start, end, last_state_.token) &&
          last_state_.error == gpu::error::kNoError) {
     MakeProgressAndUpdateState();
     TryUpdateState();
   }
 }
 
 void CommandBufferClientImpl::WaitForGetOffsetInRange(int32 start, int32 end) {
@@ skipping 126 matching lines @@
     // TODO(piman): is it ok for this to re-enter?
     DidLoseContext(gpu::error::kUnknown);
     return;
   }
 
   if (state->generation - last_state_.generation < 0x80000000U)
     last_state_ = state.To<State>();
 }
 
 }  // namespace gles2