Prompt user for file access permission before download starts

content/public/browser/android/download_controller_android.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_ANDROID_DOWNLOAD_CONTROLLER_ANDROID_H_
 #define CONTENT_PUBLIC_BROWSER_ANDROID_DOWNLOAD_CONTROLLER_ANDROID_H_
 
 #include "content/common/content_export.h"
 #include "content/public/common/context_menu_params.h"
 
@@ skipping 20 matching lines @@
 
   // Called when a download is initiated by context menu.
   virtual void StartContextMenuDownload(
       const ContextMenuParams& params, WebContents* web_contents,
       bool is_link, const std::string& extra_headers) = 0;
 
   // Called when a dangerous download item is verified or rejected.
   virtual void DangerousDownloadValidated(
       WebContents* web_contents, int download_id, bool accept) = 0;
 
+  // Returns true if prompt for file access permission is required from the
+  // user, or false otherwise.
+  virtual bool RequireUserPermissionPrompt(WebContents* web_contents) = 0;
+
+  // Callback when user permission prompt finishes.
+  typedef base::Callback<void(bool)> UserPermissionPromptCallback;
+
+  // Called to prompt the user for file access permission. When finished,
+  // |callback| will be executed.
+  virtual void PromptUserForPermission(
+      WebContents* web_contents,
+      const UserPermissionPromptCallback& callback) = 0;
+
  protected:
   virtual ~DownloadControllerAndroid() {};
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_ANDROID_DOWNLOAD_CONTROLLER_ANDROID_H_