Add PostMessage support for MimeHandlerView

content/renderer/browser_plugin/browser_plugin.h

 // Copyright 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.
 
 #ifndef  CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_H_
 #define  CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_H_
 
 #include "third_party/WebKit/public/web/WebPlugin.h"
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 60 matching lines @@
   // sent, if needed.
   void DidCommitCompositorFrame();
 
   // Returns whether a message should be forwarded to BrowserPlugin.
   static bool ShouldForwardToBrowserPlugin(const IPC::Message& message);
 
   // blink::WebPlugin implementation.
   virtual blink::WebPluginContainer* container() const override;
   virtual bool initialize(blink::WebPluginContainer* container) override;
   virtual void destroy() override;
+  virtual v8::Local<v8::Object> v8ScriptableObject(
+      v8::Isolate* isolate) override;
   virtual bool supportsKeyboardFocus() const override;
   virtual bool supportsEditCommands() const override;
   virtual bool supportsInputMethod() const override;
   virtual bool canProcessDrag() const override;
   virtual void paint(
       blink::WebCanvas* canvas,
       const blink::WebRect& rect) override;
   virtual void updateGeometry(
       const blink::WebRect& frame_rect,
       const blink::WebRect& clip_rect,
@@ skipping 123 matching lines @@
   // Weak factory used in v8 |MakeWeak| callback, since the v8 callback might
   // get called after BrowserPlugin has been destroyed.
   base::WeakPtrFactory<BrowserPlugin> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPlugin);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_H_