Prevent reentrant destructors in the PluginModule.

webkit/plugins/ppapi/ppb_proxy_impl.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 "webkit/plugins/ppapi/ppb_proxy_impl.h"
 
 #include "ppapi/c/private/ppb_proxy_private.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_image_data_api.h"
 #include "webkit/plugins/ppapi/plugin_module.h"
@@ skipping 41 matching lines @@
   if (plugin_module)
     plugin_module->AddRef();
 }
 
 void ReleaseModule(PP_Module module) {
   PluginModule* plugin_module = ResourceTracker::Get()->GetModule(module);
   if (plugin_module)
     plugin_module->Release();
 }
 
+PP_Bool IsInModuleDestructor(PP_Module module) {
+  PluginModule* plugin_module = ResourceTracker::Get()->GetModule(module);
+  if (plugin_module)
+    return PP_FromBool(plugin_module->is_in_destructor());
+  return PP_FALSE;
+}
+
 const PPB_Proxy_Private ppb_proxy = {
   &PluginCrashed,
   &GetInstanceForResource,
   &SetReserveInstanceIDCallback,
   &GetURLLoaderBufferedBytes,
   &AddRefModule,
-  &ReleaseModule
+  &ReleaseModule,
+  &IsInModuleDestructor
 };
 
 }  // namespace
 
 // static
 const PPB_Proxy_Private* PPB_Proxy_Impl::GetInterface() {
   return &ppb_proxy;
 }
 
 }  // namespace ppapi
 }  // namespace webkit