Hold the Pepper proxy lock for all Pepper GL calls.

ppapi/proxy/plugin_dispatcher.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/plugin_dispatcher.h"
 
 #include <map>
 
 #include "base/compiler_specific.h"
 #include "base/debug/trace_event.h"
@@ skipping 193 matching lines @@
   if (!msg->is_reply())
     msg->set_unblock(true);
   if (msg->is_sync()) {
     // Synchronous messages might be re-entrant, so we need to drop the lock.
     ProxyAutoUnlock unlock;
     return SendMessage(msg);
   }
   return SendMessage(msg);
 }
 
+bool PluginDispatcher::SendAndStayLocked(IPC::Message* msg) {
+  TRACE_EVENT2("ppapi proxy", "PluginDispatcher::SendAndStayLocked",
+               "Class", IPC_MESSAGE_ID_CLASS(msg->type()),
+               "Line", IPC_MESSAGE_ID_LINE(msg->type()));
+  if (!msg->is_reply())
+    msg->set_unblock(true);
+  return SendMessage(msg);
+}
+
 bool PluginDispatcher::OnMessageReceived(const IPC::Message& msg) {
   // We need to grab the proxy lock to ensure that we don't collide with the
   // plugin making pepper calls on a different thread.
   ProxyAutoLock lock;
   TRACE_EVENT2("ppapi proxy", "PluginDispatcher::OnMessageReceived",
                "Class", IPC_MESSAGE_ID_CLASS(msg.type()),
                "Line", IPC_MESSAGE_ID_LINE(msg.type()));
 
   if (msg.routing_id() == MSG_ROUTING_CONTROL) {
     // Handle some plugin-specific control messages.
@@ skipping 96 matching lines @@
   // once they're set. The user will have to restart to get new font prefs
   // propogated to plugins.
   if (!received_preferences_) {
     received_preferences_ = true;
     preferences_ = prefs;
   }
 }
 
 }  // namespace proxy
 }  // namespace ppapi