Hold the Pepper proxy lock for all Pepper GL calls.

ppapi/proxy/proxy_channel.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 "ppapi/proxy/proxy_channel.h"
 
 #include "base/logging.h"
 #include "ipc/ipc_platform_file.h"
 #include "ipc/ipc_test_sink.h"
 
@@ skipping 67 matching lines @@
   if (test_sink_)
     return test_sink_->Send(msg);
   if (channel_.get())
     return channel_->Send(msg);
 
   // Remote side crashed, drop this message.
   delete msg;
   return false;
 }
 
+bool ProxyChannel::SendAndStayLocked(IPC::Message* msg) {
+  return Send(msg);
+}
+
 }  // namespace proxy
 }  // namespace ppapi