Avoid sync IPCs for FileSystem API

chrome/renderer/content_settings_observer.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 CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_
 #define CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_
 
 #include <map>
 #include <set>
 
@@ skipping 36 matching lines @@
 
   // Sends an IPC notification that the specified content type was blocked.
   void DidBlockContentType(ContentSettingsType settings_type);
 
   // blink::WebPermissionClient implementation.
   virtual bool allowDatabase(blink::WebFrame* frame,
                              const blink::WebString& name,
                              const blink::WebString& display_name,
                              unsigned long estimated_size);
   virtual bool allowFileSystem(blink::WebFrame* frame);
+  virtual void requestFileSystemAccess(
+      blink::WebFrame* frame,
+      const blink::WebPermissionCallbacks& callbacks);
   virtual bool allowImage(blink::WebFrame* frame,
                           bool enabled_per_settings,
                           const blink::WebURL& image_url);
   virtual bool allowIndexedDB(blink::WebFrame* frame,
                               const blink::WebString& name,
                               const blink::WebSecurityOrigin& origin);
   virtual bool allowPlugins(blink::WebFrame* frame,
                             bool enabled_per_settings);
   virtual bool allowScript(blink::WebFrame* frame,
                            bool enabled_per_settings);
@@ skipping 35 matching lines @@
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void DidCommitProvisionalLoad(bool is_new_navigation) OVERRIDE;
 
   // Message handlers.
   void OnLoadBlockedPlugins(const std::string& identifier);
   void OnSetAsInterstitial();
   void OnNPAPINotSupported();
   void OnSetAllowDisplayingInsecureContent(bool allow);
   void OnSetAllowRunningInsecureContent(bool allow);
   void OnReloadFrame();
+  void OnRequestFileSystemAccessACK(int request_id, bool allowed);
 
   // Resets the |content_blocked_| array.
   void ClearBlockedContentSettings();
 
   // If |origin| corresponds to an installed extension, returns that extension.
   // Otherwise returns NULL.
   const extensions::Extension* GetExtension(
       const blink::WebSecurityOrigin& origin) const;
 
   // Helpers.
@@ skipping 27 matching lines @@
   std::map<blink::WebFrame*, bool> cached_script_permissions_;
 
   std::set<std::string> temporarily_allowed_plugins_;
   bool is_interstitial_page_;
   bool npapi_plugins_blocked_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentSettingsObserver);
 };
 
 #endif  // CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_