Allow MimeHandlerViewGuest be embedded inside OOPIFs

extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h

Index: extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
diff --git a/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h b/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
index 87d249eb30ecdd268c56a8965caf04a362a2f36c..d237318c047b48fc702cabaae2fcb491cc308c58 100644
--- a/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
+++ b/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
@@ -58,7 +58,13 @@ class MimeHandlerViewGuest :
 
   static const char Type[];
 
+  // BrowserPluginGuestDelegate overrides.
   bool CanUseCrossProcessFrames() override;
+  bool CanBeEmbeddedInsideCrossProcessFrames() override;
+  content::RenderWidgetHost* GetOwnerRenderWidgetHost() override;
+  content::SiteInstance* GetOwnerSiteInstance() override;
+
+  void SetEmbedderFrame(int process_id, int routing_id);
 
  protected:
   explicit MimeHandlerViewGuest(content::WebContents* owner_web_contents);
@@ -89,6 +95,7 @@ class MimeHandlerViewGuest :
   content::JavaScriptDialogManager* GetJavaScriptDialogManager(
       content::WebContents* source) final;
   bool SaveFrame(const GURL& url, const content::Referrer& referrer) final;
+  void OnRenderFrameHostDeleted(int process_id, int routing_id) final;
 
   // content::WebContentsObserver implementation.
   void DocumentOnLoadCompletedInMainFrame() final;
@@ -100,6 +107,10 @@ class MimeHandlerViewGuest :
   std::unique_ptr<StreamContainer> stream_;
   std::string view_id_;
 
+  int embedder_frame_process_id_;
+  int embedder_frame_routing_id_;
+  int embedder_widget_routing_id_;
+
   DISALLOW_COPY_AND_ASSIGN(MimeHandlerViewGuest);
 };