Allow a main interstitial frame to act as an ExtensionMessagePort opener

content/browser/frame_host/interstitial_page_impl.h

 // Copyright 2013 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 CONTENT_BROWSER_FRAME_HOST_INTERSTITIAL_PAGE_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_INTERSTITIAL_PAGE_IMPL_H_
 
 #include <stdint.h>
 
 #include "base/compiler_specific.h"
@@ skipping 89 matching lines @@
                const NotificationDetails& details) override;
 
   // RenderFrameHostDelegate implementation:
   bool OnMessageReceived(RenderFrameHost* render_frame_host,
                          const IPC::Message& message) override;
   void RenderFrameCreated(RenderFrameHost* render_frame_host) override;
   void UpdateTitle(RenderFrameHost* render_frame_host,
                    int32_t page_id,
                    const base::string16& title,
                    base::i18n::TextDirection title_direction) override;
+  InterstitialPage* GetAsInterstitialPage() override;
   AccessibilityMode GetAccessibilityMode() const override;
   void Cut() override;
   void Copy() override;
   void Paste() override;
   void SelectAll() override;
 
   // RenderViewHostDelegate implementation:
   RenderViewHostDelegateView* GetDelegateView() override;
   bool OnMessageReceived(RenderViewHost* render_view_host,
                          const IPC::Message& message) override;
@@ skipping 30 matching lines @@
   // RenderWidgetHostDelegate implementation:
   void RenderWidgetDeleted(RenderWidgetHostImpl* render_widget_host) override;
   bool PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
                               bool* is_keyboard_shortcut) override;
   void HandleKeyboardEvent(const NativeWebKeyboardEvent& event) override;
 #if defined(OS_WIN)
   gfx::NativeViewAccessible GetParentNativeViewAccessible() override;
 #endif
 
   bool enabled() const { return enabled_; }
-  WebContents* web_contents() const;
+  WebContents* web_contents() const override;
   const GURL& url() const { return url_; }
 
   // Creates the WebContentsView that shows the interstitial RVH.
   // Overriden in unit tests.
   virtual WebContentsView* CreateWebContentsView();
 
   // Notification magic.
   NotificationRegistrar notification_registrar_;
 
  private:
@@ skipping 123 matching lines @@
   scoped_refptr<SessionStorageNamespace> session_storage_namespace_;
 
   base::WeakPtrFactory<InterstitialPageImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InterstitialPageImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_INTERSTITIAL_PAGE_IMPL_H_