Add Worker support for FileSystem API.

chrome/worker/worker_webkitclient_impl.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/worker/worker_webkitclient_impl.h"
 
 #include "base/logging.h"
 #include "chrome/common/database_util.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/render_messages_params.h"
 #include "chrome/common/webblobregistry_impl.h"
 #include "chrome/common/webmessageportchannel_impl.h"
 #include "chrome/worker/worker_thread.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebBlobRegistry.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebString.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebURL.h"
 
 using WebKit::WebBlobRegistry;
 using WebKit::WebClipboard;
+using WebKit::WebFileSystem;
 using WebKit::WebKitClient;
 using WebKit::WebMessagePortChannel;
 using WebKit::WebMimeRegistry;
 using WebKit::WebSandboxSupport;
 using WebKit::WebSharedWorkerRepository;
 using WebKit::WebStorageNamespace;
 using WebKit::WebString;
 using WebKit::WebURL;
 
 WebClipboard* WorkerWebKitClientImpl::clipboard() {
   NOTREACHED();
   return NULL;
 }
 
 WebMimeRegistry* WorkerWebKitClientImpl::mimeRegistry() {
   return this;
 }
 
+WebKit::WebFileSystem* WorkerWebKitClientImpl::fileSystem() {
+  if (!web_file_system_.get())
+    web_file_system_.reset(new WebFileSystemImpl());
+  return web_file_system_.get();
+}
+
 WebKit::WebFileUtilities* WorkerWebKitClientImpl::fileUtilities() {
   return &file_utilities_;
 }
 
 WebSandboxSupport* WorkerWebKitClientImpl::sandboxSupport() {
   NOTREACHED();
   return NULL;
 }
 
 bool WorkerWebKitClientImpl::sandboxEnabled() {
@@ skipping 126 matching lines @@
     const WebString&) {
   NOTREACHED();
   return WebString();
 }
 
 WebBlobRegistry* WorkerWebKitClientImpl::blobRegistry() {
   if (!blob_registry_.get())
     blob_registry_.reset(new WebBlobRegistryImpl(WorkerThread::current()));
   return blob_registry_.get();
 }