Allow only responsive websites to install as a web app on mobile.

chrome/browser/banners/app_banner_manager.h

 // Copyright 2015 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_BANNERS_APP_BANNER_MANAGER_H_
 #define CHROME_BROWSER_BANNERS_APP_BANNER_MANAGER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 26 matching lines @@
   static bool URLsAreForTheSamePage(const GURL& first, const GURL& second);
 
   explicit AppBannerManager(int icon_size);
   ~AppBannerManager() override;
 
   // WebContentsObserver overrides.
   void DidFinishLoad(content::RenderFrameHost* render_frame_host,
                      const GURL& validated_url) override;
 
  protected:
+  bool ValidateFrameHostAndOrigin(content::RenderFrameHost* render_frame_host,
+                                  const GURL& validated_url);
   void ReplaceWebContents(content::WebContents* web_contents);
 
   // Creates an AppBannerDataFetcher, which constructs an app banner.
   virtual AppBannerDataFetcher* CreateAppBannerDataFetcher(
       base::WeakPtr<AppBannerDataFetcher::Delegate> weak_delegate,
       const int ideal_icon_size);
 
   // Return whether the AppBannerDataFetcher is active.
   bool IsFetcherActive();
 
@@ skipping 26 matching lines @@
   // longer than the lifetime of this banner manager. The banner manager
   // might be gone when calls sent to the ServiceWorkerContext are completed.
   base::WeakPtrFactory<AppBannerManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AppBannerManager);
 };  // class AppBannerManager
 
 }  // namespace banners
 
 #endif  // CHROME_BROWSER_BANNERS_APP_BANNER_MANAGER_H_