Prompt user for file access permission before download starts

content/public/browser/android/download_controller_android.h

Index: content/public/browser/android/download_controller_android.h
diff --git a/content/public/browser/android/download_controller_android.h b/content/public/browser/android/download_controller_android.h
index fd035d734ec1c5bffd3b2580c8501c5f8c60b361..03edddae1c9d5c1e9b181c79bb1119bb5f87b50a 100644
--- a/content/public/browser/android/download_controller_android.h
+++ b/content/public/browser/android/download_controller_android.h
@@ -38,6 +38,19 @@ class CONTENT_EXPORT DownloadControllerAndroid {
   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() {};
 };