Implementation of shared worker code path for WebView file system permission.

chrome/browser/guest_view/web_view/web_view_guest.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_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_
 #define CHROME_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_
 
 #include <vector>
 
 #include "base/observer_list.h"
@@ skipping 182 matching lines @@
       const PermissionResponseCallback& callback,
       bool allowed_by_default);
 
   // Requests Geolocation Permission from the embedder.
   void RequestGeolocationPermission(int bridge_id,
                                     const GURL& requesting_frame,
                                     bool user_gesture,
                                     const base::Callback<void(bool)>& callback);
   void CancelGeolocationPermissionRequest(int bridge_id);
 
+  // Called when file system access is requested by the guest content using the
+  // HTML5 file system API in main thread, or a worker thread.
+  // The request is plumbed through the <webview> permission request API. The
+  // request will be:
+  // - Allowed if the embedder explicitly allowed it.
+  // - Denied if the embedder explicitly denied.
+  // - Determined by the guest's content settings if the embedder does not
+  // perform an explicit action.
   void RequestFileSystemPermission(const GURL& url,
                                    bool allowed_by_default,
                                    const base::Callback<void(bool)>& callback);
 
   // Overrides the user agent for this guest.
   // This affects subsequent guest navigations.
   void SetUserAgentOverride(const std::string& user_agent_override);
 
   // Stop loading the guest.
   void Stop();
@@ skipping 164 matching lines @@
         changed(false) {}
   };
 
   typedef std::map<WebViewGuest*, NewWindowInfo> PendingWindowMap;
   PendingWindowMap pending_new_windows_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewGuest);
 };
 
 #endif  // CHROME_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_