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>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
+#include "chrome/browser/ui/browser_list_observer.h"
 #include "chrome/browser/ui/permission_bubble/permission_prompt.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 class PermissionRequest;
 
 namespace safe_browsing {
 class PermissionReporterBrowserTest;
 }
 
 namespace test {
 class PermissionRequestManagerTestApi;
 }
 
 // Provides access to permissions bubbles. Allows clients to add a request
 // callback interface to the existing permission bubble configuration.
 // Depending on the situation and policy, that may add new UI to an existing
 // permission bubble, create and show a new permission bubble, or provide no
 // visible UI action at all. (In that case, the request will be immediately
 // informed that the permission request failed.)
 //
 // A PermissionRequestManager is associated with a particular WebContents.
 // Requests attached to a particular WebContents' PBM must outlive it.
 //
 // The PermissionRequestManager should be addressed on the UI thread.
 class PermissionRequestManager
     : public content::WebContentsObserver,
       public content::WebContentsUserData<PermissionRequestManager>,
-      public PermissionPrompt::Delegate {
+      public PermissionPrompt::Delegate,
+      public chrome::BrowserListObserver {
  public:
   class Observer {
    public:
     virtual ~Observer();
     virtual void OnBubbleAdded();
   };
 
   enum AutoResponseType {
     NONE,
     ACCEPT_ALL,
@@ skipping 82 matching lines @@
       content::RenderFrameHost* render_frame_host) override;
   void WebContentsDestroyed() override;
 
   // PermissionPrompt::Delegate:
   void ToggleAccept(int request_index, bool new_value) override;
   void TogglePersist(bool new_value) override;
   void Accept() override;
   void Deny() override;
   void Closing() override;
 
+  // chrome::BrowserListObserver:
+  void OnBrowserSetLastActive(Browser* browser) override;
+
   // Posts a task which will allow the bubble to become visible if it is needed.
   void ScheduleShowBubble();
 
   // Shows the bubble if it is not already visible and there are pending
   // requests.
   void TriggerShowBubble();
 
   // Finalize the pending permissions request.
   void FinalizeBubble();
 
@@ skipping 50 matching lines @@
   // 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_