Update from https://crrev.com/315085

mojo/gles2/command_buffer_client_impl.cc

Index: mojo/gles2/command_buffer_client_impl.cc
diff --git a/mojo/gles2/command_buffer_client_impl.cc b/mojo/gles2/command_buffer_client_impl.cc
index e8d3690cfd60a970785bfd482a8508e4e2ec1df4..494ff3d6dee78a0ce5402b74e5bc5e8e9425dd8b 100644
--- a/mojo/gles2/command_buffer_client_impl.cc
+++ b/mojo/gles2/command_buffer_client_impl.cc
@@ -180,6 +180,11 @@ void CommandBufferClientImpl::Flush(int32 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) &&