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

android_webview/browser/aw_content_browser_client.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 ANDROID_WEBVIEW_LIB_AW_CONTENT_BROWSER_CLIENT_H_
 #define ANDROID_WEBVIEW_LIB_AW_CONTENT_BROWSER_CLIENT_H_
 
 #include "android_webview/browser/aw_web_preferences_populater.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 63 matching lines @@
                               int render_process_id,
                               int render_frame_id,
                               net::CookieOptions* options) OVERRIDE;
   virtual bool AllowWorkerDatabase(
       const GURL& url,
       const base::string16& name,
       const base::string16& display_name,
       unsigned long estimated_size,
       content::ResourceContext* context,
       const std::vector<std::pair<int, int> >& render_frames) OVERRIDE;
-  virtual bool AllowWorkerFileSystem(
+  virtual void RequestFileSystemAccessSync(

[boliu, 2014/06/19 15:57:35]

Weird name? It appears the callback allows this to be async, yet the name says
sync?

[Xi Han, 2014/06/19 16:37:46]

The name comes from the webview guest, when a webview guest requests file system
access, whether it calls a sync api or async api. Now we have both apis:
1) sync api for a request from shared worker & worker (the request will block
workers);
2) async api for a request from a webview guest main thread (request won't block
main thread).

We use a sync message (WorkerProcessHostMsg_RequestFileSystemAccessSync) to
request this api.

Sorry for the confusion.

       const GURL& url,
       content::ResourceContext* context,
-      const std::vector<std::pair<int, int> >& render_frames) OVERRIDE;
+      const std::vector<std::pair<int, int> >& render_frames,
+      base::Callback<void(bool)> callback) OVERRIDE;
   virtual bool AllowWorkerIndexedDB(
       const GURL& url,
       const base::string16& name,
       content::ResourceContext* context,
       const std::vector<std::pair<int, int> >& render_frames) OVERRIDE;
   virtual content::QuotaPermissionContext*
       CreateQuotaPermissionContext() OVERRIDE;
   virtual void AllowCertificateError(
       int render_process_id,
       int render_frame_id,
@@ skipping 91 matching lines @@
   scoped_ptr<AwWebPreferencesPopulater> preferences_populater_;
 
   JniDependencyFactory* native_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AwContentBrowserClient);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_LIB_AW_CONTENT_BROWSER_CLIENT_H_