Adding MimeHandlerView.

extensions/browser/extension_message_filter.h

Index: extensions/browser/extension_message_filter.h
diff --git a/extensions/browser/extension_message_filter.h b/extensions/browser/extension_message_filter.h
index ac4caaf06efeffdb8a49441e49c2128ed62ba73c..f567def01d5af3dd9f420c9d6b6e6a3316f1ec3b 100644
--- a/extensions/browser/extension_message_filter.h
+++ b/extensions/browser/extension_message_filter.h
@@ -22,6 +22,7 @@ class DictionaryValue;
 
 namespace content {
 class BrowserContext;
+class WebContents;
 }
 
 namespace extensions {
@@ -64,6 +65,10 @@ class ExtensionMessageFilter : public content::BrowserMessageFilter {
                               int element_instance_id,
                               int guest_instance_id,
                               const base::DictionaryValue& attach_params);
+  void OnExtensionCreateMimeHandlerViewGuest(int render_frame_id,
+                                             const std::string& url,
+                                             const std::string& mime_type,
+                                             int element_instance_id);
   void OnExtensionRemoveLazyListener(const std::string& extension_id,
                                      const std::string& event_name);
   void OnExtensionAddFilteredListener(const std::string& extension_id,
@@ -86,6 +91,13 @@ class ExtensionMessageFilter : public content::BrowserMessageFilter {
       int routing_id,
       const ExtensionHostMsg_Request_Params& params);
 
+  // Runs on UI thread.
+  void MimeHandlerViewGuestCreatedCallback(int element_instance_id,
+                                           int embedder_render_process_id,
+                                           int embedder_routing_id,
+                                           const std::string& src,
+                                           content::WebContents* web_contents);
+
   const int render_process_id_;
 
   // Should only be accessed on the UI thread.