[fsp] Add support for creating directories.

chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util.cc

Index: chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util.cc
diff --git a/chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util.cc b/chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util.cc
index f733a1cdd844cb4de52b1a1c0ee714da3356d8c2..a3f0ce62af96ede7dc541876898814c9c71baf67 100644
--- a/chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util.cc
+++ b/chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util.cc
@@ -83,6 +83,30 @@ void OnReadDirectory(
                           base::Bind(callback, result, entry_list, has_more));
 }
 
+// Executes CreateDirectory on the UI thread.
+void CreateDirectoryOnUIThread(
+    scoped_ptr<fileapi::FileSystemOperationContext> context,
+    const fileapi::FileSystemURL& url,
+    bool exclusive,
+    bool recursive,
+    const fileapi::AsyncFileUtil::StatusCallback& callback) {
+  util::FileSystemURLParser parser(url);
+  if (!parser.Parse()) {
+    callback.Run(base::File::FILE_ERROR_INVALID_OPERATION);
+    return;
+  }
+
+  parser.file_system()->CreateDirectory(
+      parser.file_path(), exclusive, recursive, callback);
+}
+
+// Routes the response of CreateDirectory back to the IO thread.
+void OnCreateDirectory(const fileapi::AsyncFileUtil::StatusCallback& callback,
+                       base::File::Error result) {
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE, base::Bind(callback, result));
+}
+
 }  // namespace
 
 ProviderAsyncFileUtil::ProviderAsyncFileUtil() {}
@@ -124,7 +148,14 @@ void ProviderAsyncFileUtil::CreateDirectory(
     bool recursive,
     const StatusCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
-  callback.Run(base::File::FILE_ERROR_ACCESS_DENIED);
+  BrowserThread::PostTask(BrowserThread::UI,
+                          FROM_HERE,
+                          base::Bind(&CreateDirectoryOnUIThread,
+                                     base::Passed(&context),
+                                     url,
+                                     exclusive,
+                                     recursive,
+                                     base::Bind(&OnCreateDirectory, callback)));
 }
 
 void ProviderAsyncFileUtil::GetFileInfo(