Add PostMessage support for MimeHandlerView

content/public/renderer/browser_plugin_delegate.h

Index: content/public/renderer/browser_plugin_delegate.h
diff --git a/content/public/renderer/browser_plugin_delegate.h b/content/public/renderer/browser_plugin_delegate.h
index 011011ee541e6c1311012724ad267c50c926a930..5485a7de5bc84a785d188b7b0550909473d5432a 100644
--- a/content/public/renderer/browser_plugin_delegate.h
+++ b/content/public/renderer/browser_plugin_delegate.h
@@ -10,6 +10,12 @@
 #include "content/common/content_export.h"
 #include "ipc/ipc_message.h"
 
+namespace v8 {
+class Isolate;
+class Object;
+template<typename T> class Local;
+}  // namespace v8
+
 namespace content {
 
 class RenderFrame;
@@ -38,6 +44,9 @@ class CONTENT_EXPORT BrowserPluginDelegate {
   // Called when a message is received.  Returns true iff the message was
   // handled.
   virtual bool OnMessageReceived(const IPC::Message& message);
+
+  // Return a scriptable object for the plugin.
+  virtual v8::Local<v8::Object> V8ScriptableObject(v8::Isolate* isolate);
 };
 
 }  // namespace content