Adding a TouchFile() operation.

chrome/common/file_system/file_system_dispatcher.cc

Index: chrome/common/file_system/file_system_dispatcher.cc
===================================================================
--- chrome/common/file_system/file_system_dispatcher.cc	(revision 60236)
+++ chrome/common/file_system/file_system_dispatcher.cc	(working copy)
@@ -99,6 +99,17 @@
       new ViewHostMsg_FileSystem_ReadDirectory(request_id, path));
 }
 
+bool FileSystemDispatcher::TouchFile(
+    const FilePath& path,
+    const base::Time& last_access_time,
+    const base::Time& last_modified_time,
+    fileapi::FileSystemCallbackDispatcher* dispatcher) {
+  int request_id = dispatchers_.Add(dispatcher);
+  return ChildThread::current()->Send(
+      new ViewHostMsg_FileSystem_TouchFile(
+          request_id, path, last_access_time, last_modified_time));
+}
+
 void FileSystemDispatcher::DidSucceed(int request_id) {
   fileapi::FileSystemCallbackDispatcher* dispatcher =
       dispatchers_.Lookup(request_id);