Add initial support for runtime permissions in android M.

chrome/browser/content_settings/permission_infobar_delegate.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_CONTENT_SETTINGS_PERMISSION_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_PERMISSION_INFOBAR_DELEGATE_H_
 
 #include "chrome/browser/infobars/infobar_service.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 #include "components/content_settings/core/common/permission_request_id.h"
 #include "components/infobars/core/confirm_infobar_delegate.h"
 #include "content/public/browser/web_contents.h"
 
 class NavigationDetails;
 class PermissionQueueController;
 
 // Base class for permission infobars, it implements the default behavior
 // so that the accept/deny buttons grant/deny the relevant permission.
 // A basic implementor only needs to implement the methods that
 // provide an icon and a message text to the infobar.
 class PermissionInfobarDelegate : public ConfirmInfoBarDelegate {
 
+ public:
+  ContentSettingsType content_setting() const { return type_; }
+
  protected:
   PermissionInfobarDelegate(PermissionQueueController* controller,
                             const PermissionRequestID& id,
                             const GURL& requesting_origin,
                             ContentSettingsType type);
   ~PermissionInfobarDelegate() override;
 
  private:
   // ConfirmInfoBarDelegate:
   Type GetInfoBarType() const override;
   void InfoBarDismissed() override;
+  PermissionInfobarDelegate* AsPermissionInfobarDelegate() override;
   base::string16 GetButtonLabel(InfoBarButton button) const override;
   bool Accept() override;
   bool Cancel() override;
 
   void SetPermission(bool update_content_setting, bool allowed);
 
   PermissionQueueController* controller_; // not owned by us
   const PermissionRequestID id_;
   GURL requesting_origin_;
   bool action_taken_;
   ContentSettingsType type_;
 
   DISALLOW_COPY_AND_ASSIGN(PermissionInfobarDelegate);
 };
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_PERMISSION_INFOBAR_DELEGATE_H_