Add PermissionPromptAndroid skeleton

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 66 matching lines @@
   // the web contents that the PermissionRequestManager belongs to.
   void DisplayPendingRequests();
 
   // Will reposition the bubble (may change parent if necessary).
   void UpdateAnchorPosition();
 
   // True if a permission bubble is currently visible.
   // TODO(hcarmona): Remove this as part of the bubble API work.
   bool IsBubbleVisible();
 
+  static bool IsEnabled();

[raymes, 2016/10/19 00:25:41]

nit: please add a comment about what this does

[lshang, 2016/10/20 05:03:10]

Done.

+
   // 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);
 
   // Do NOT use this methods in production code. Use this methods in browser
   // tests that need to accept or deny permissions when requested in
@@ skipping 96 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_