Fix plugin hang that Earth team found....

chrome/plugin/npobject_stub.h

 // Copyright (c) 2006-2008 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.
 //
 // A class that receives IPC messages from an NPObjectProxy and calls the real
 // NPObject.
 
 #ifndef CHROME_PLUGIN_NPOBJECT_STUB_H_
 #define CHROME_PLUGIN_NPOBJECT_STUB_H_
 
 #include <vector>
 
 #include "base/ref_counted.h"
 #include "chrome/common/ipc_channel.h"
 
+namespace base {
+class WaitableEvent;
+}
+
 class PluginChannelBase;
 class WebPluginDelegateProxy;
 struct NPIdentifier_Param;
 struct NPObject;
 struct NPVariant_Param;
 
 // This wraps an NPObject and converts IPC messages from NPObjectProxy to calls
 // to the object.  The results are marshalled back.  See npobject_proxy.h for
 // more information.
 class NPObjectStub : public IPC::Channel::Listener,
                      public IPC::Message::Sender {
  public:
-  NPObjectStub(NPObject* npobject, PluginChannelBase* channel, int route_id);
+  NPObjectStub(NPObject* npobject,
+               PluginChannelBase* channel,
+               int route_id,
+               base::WaitableEvent* modal_dialog_event);
   ~NPObjectStub();
 
   // IPC::Message::Sender implementation:
   bool Send(IPC::Message* msg);
 
   // Called when the plugin widget that this NPObject came from is destroyed.
   // This is needed because the renderer calls NPN_DeallocateObject on the
   // window script object on destruction to avoid leaks.
   void set_invalid() { valid_ = false; }
   void set_proxy(WebPluginDelegateProxy* proxy) {
@@ skipping 28 matching lines @@
                      bool* result);
   void OnEvaluate(const std::string& script, bool popups_allowed,
                   IPC::Message* reply_msg);
   void OnSetException(const std::string& message);
 
  private:
   NPObject* npobject_;
   int route_id_;
   scoped_refptr<PluginChannelBase> channel_;
 
+  base::WaitableEvent* modal_dialog_event_;
+
   // These variables are used to ensure that the window script object is not
   // called after the plugin widget has gone away, as the frame manually
   // deallocates it and ignores the refcount to avoid leaks.
   bool valid_;
   WebPluginDelegateProxy* web_plugin_delegate_proxy_;
 };
 
 #endif  // CHROME_PLUGIN_NPOBJECT_STUB_H_