Adding MimeHandlerView.

content/renderer/browser_plugin/browser_plugin.h

Index: content/renderer/browser_plugin/browser_plugin.h
diff --git a/content/renderer/browser_plugin/browser_plugin.h b/content/renderer/browser_plugin/browser_plugin.h
index 925ee2384b34edb3cb4f6f097f4e85f258a6bb38..2b8f47a57c4b3b25462c146a3762fdcdab59529b 100644
--- a/content/renderer/browser_plugin/browser_plugin.h
+++ b/content/renderer/browser_plugin/browser_plugin.h
@@ -40,6 +40,8 @@ class CONTENT_EXPORT BrowserPlugin :
     return browser_plugin_manager_.get();
   }
 
+  void AttachToPlugin(int instance_id);
+
   bool OnMessageReceived(const IPC::Message& msg);
 
   // Update Browser Plugin's DOM Node attribute |attribute_name| with the value
@@ -288,6 +290,12 @@ class CONTENT_EXPORT BrowserPlugin :
   gfx::Size last_view_size_;
   bool mouse_locked_;
 
+  bool attach_called_;
+  bool seen_src_;
+  int pending_instance_id_;
+
+  void MaybeAttach();
+
   // BrowserPlugin outlives RenderViewImpl in Chrome Apps and so we need to
   // store the BrowserPlugin's BrowserPluginManager in a member variable to
   // avoid accessing the RenderViewImpl.