GuestViews should be able to specify task manager entries

chrome/browser/guest_view/app_view/chrome_app_view_guest_delegate.h

 // Copyright 2014 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 CHROME_BROWSER_GUEST_VIEW_APP_VIEW_CHROME_APP_VIEW_GUEST_DELEGATE_H_
 #define CHROME_BROWSER_GUEST_VIEW_APP_VIEW_CHROME_APP_VIEW_GUEST_DELEGATE_H_
 
 #include "content/public/common/context_menu_params.h"
+#include "extensions/browser/guest_view/app_view/app_view_guest.h"
 #include "extensions/browser/guest_view/app_view/app_view_guest_delegate.h"
 
 namespace extensions {
 
 class ChromeAppViewGuestDelegate : public AppViewGuestDelegate {
  public:
-  ChromeAppViewGuestDelegate();
+  explicit ChromeAppViewGuestDelegate(
+    extensions::AppViewGuest* app_view_guest);
   virtual ~ChromeAppViewGuestDelegate();
 
+  // AppViewGuestDelegate implemenation.
+  virtual int GetTaskPrefix() const OVERRIDE;
   virtual bool HandleContextMenu(
       content::WebContents* web_contents,
       const content::ContextMenuParams& params) OVERRIDE;
 
  private:
+  content::WebContents* guest_web_contents() const {
+    return app_view_guest()->guest_web_contents();
+  }
+
   DISALLOW_COPY_AND_ASSIGN(ChromeAppViewGuestDelegate);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_GUEST_VIEW_APP_VIEW_CHROME_APP_VIEW_GUEST_DELEGATE_H_