Add a context parameter to callOnMainThread. The old form is going to be...

webkit/glue/webkitclient_impl.h

 // Copyright (c) 2010 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.
 
 #ifndef WEBKIT_CLIENT_IMPL_H_
 #define WEBKIT_CLIENT_IMPL_H_
 
 #include "base/platform_file.h"
 #include "base/timer.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebKitClient.h"
@@ skipping 51 matching lines @@
   virtual WebKit::WebString queryLocalizedString(
       WebKit::WebLocalizedString::Name name);
   virtual WebKit::WebString queryLocalizedString(
       WebKit::WebLocalizedString::Name name, int numeric_value);
   virtual void suddenTerminationChanged(bool enabled) { }
   virtual double currentTime();
   virtual void setSharedTimerFiredFunction(void (*func)());
   virtual void setSharedTimerFireTime(double fireTime);
   virtual void stopSharedTimer();
   virtual void callOnMainThread(void (*func)());
+  virtual void callOnMainThread(void (*func)(void*), void* context);
 
   void SuspendSharedTimer();
   void ResumeSharedTimer();
 
  private:
   void DoTimeout() {
     if (shared_timer_func_ && !shared_timer_suspended_)
       shared_timer_func_();
   }
 
   MessageLoop* main_loop_;
   base::OneShotTimer<WebKitClientImpl> shared_timer_;
   void (*shared_timer_func_)();
   double shared_timer_fire_time_;
   int shared_timer_suspended_;  // counter
 
 #if defined(OS_WIN)
   WebThemeEngineImpl theme_engine_;
 #endif
 };
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_CLIENT_IMPL_H_