Make much of the proxy thread-safe with 1 great big lock.

ppapi/proxy/ppb_core_proxy.cc

 // Copyright (c) 2011 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/ppb_core_proxy.h"
 
 #include <stdlib.h>  // For malloc
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/message_loop_proxy.h"
 #include "base/time.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/ppb_core.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/plugin_resource_tracker.h"
 #include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/shared_impl/proxy_lock.h"
 #include "ppapi/shared_impl/time_conversion.h"
 
 namespace ppapi {
 namespace proxy {
 
 namespace {
 
 base::MessageLoopProxy* GetMainThreadMessageLoop() {
   static scoped_refptr<base::MessageLoopProxy> proxy(
       base::MessageLoopProxy::current());
   return proxy.get();
 }
 
 void AddRefResource(PP_Resource resource) {
+  ppapi::ProxyAutoLock lock;
   PluginResourceTracker::GetInstance()->AddRefResource(resource);
 }
 
 void ReleaseResource(PP_Resource resource) {
+  ppapi::ProxyAutoLock lock;
   PluginResourceTracker::GetInstance()->ReleaseResource(resource);
 }
 
 double GetTime() {
   return TimeToPPTime(base::Time::Now());
 }
 
 double GetTimeTicks() {
   return TimeTicksToPPTimeTicks(base::TimeTicks::Now());
 }
@@ skipping 62 matching lines @@
 void PPB_Core_Proxy::OnMsgAddRefResource(const HostResource& resource) {
   ppb_core_impl_->AddRefResource(resource.host_resource());
 }
 
 void PPB_Core_Proxy::OnMsgReleaseResource(const HostResource& resource) {
   ppb_core_impl_->ReleaseResource(resource.host_resource());
 }
 
 }  // namespace proxy
 }  // namespace ppapi