Do not show permission bubble when browser is not active

chrome/browser/permissions/permission_request_manager.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_PERMISSIONS_PERMISSION_REQUEST_MANAGER_H_
 #define CHROME_BROWSER_PERMISSIONS_PERMISSION_REQUEST_MANAGER_H_
 
 #include <unordered_map>
 #include <vector>
 
@@ skipping 84 matching lines @@
   static bool IsEnabled();
 
   // Get the native window of the bubble.
   // TODO(hcarmona): Remove this as part of the bubble API work.
   gfx::NativeWindow GetBubbleWindow();
 
   // For observing the status of the permission bubble manager.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
+  // Called when |web_contents()| is active, and its browser's visibility
+  // changed.
+  void OnBrowserVisibilityChanged(bool visible);
+
   // Do NOT use this methods in production code. Use this methods in browser
   // tests that need to accept or deny permissions when requested in
   // JavaScript. Your test needs to set this appropriately, and then the bubble
   // will proceed as desired as soon as Show() is called.
   void set_auto_response_for_test(AutoResponseType response) {
     auto_response_for_test_ = response;
   }
 
  private:
   friend class test::PermissionRequestManagerTestApi;
@@ skipping 64 matching lines @@
   void NotifyBubbleAdded();
 
   void DoAutoResponseForTesting();
 
   // Factory to be used to create views when needed.
   PermissionPrompt::Factory view_factory_;
 
   // The UI surface to be used to display the permissions requests.
   std::unique_ptr<PermissionPrompt> view_;
 
+  // Whether the browser that hosts |web_contents()| is visible.
+  bool browser_visible_;
+
   std::vector<PermissionRequest*> requests_;
   std::vector<PermissionRequest*> queued_requests_;
   std::vector<PermissionRequest*> queued_frame_requests_;
   // Maps from the first request of a kind to subsequent requests that were
   // duped against it.
   std::unordered_multimap<PermissionRequest*, PermissionRequest*>
       duplicate_requests_;
 
   // URL of the main frame in the WebContents to which this manager is attached.
   // TODO(gbillock): if there are iframes in the page, we need to deal with it.
   GURL request_url_;
   bool main_frame_has_fully_loaded_;
 
   // Whether the response to each request should be persisted.
   bool persist_;
 
   // Whether each of the requests in |requests_| is accepted by the user.
   std::vector<bool> accept_states_;
 
   base::ObserverList<Observer> observer_list_;
   AutoResponseType auto_response_for_test_;
 
   base::WeakPtrFactory<PermissionRequestManager> weak_factory_;
 };
 
 #endif  // CHROME_BROWSER_PERMISSIONS_PERMISSION_REQUEST_MANAGER_H_