Adding a TouchFile() operation.

webkit/fileapi/file_system_operation.cc

Index: webkit/fileapi/file_system_operation.cc
===================================================================
--- webkit/fileapi/file_system_operation.cc	(revision 60236)
+++ webkit/fileapi/file_system_operation.cc	(working copy)
@@ -4,6 +4,7 @@
 
 #include "webkit/fileapi/file_system_operation.h"
 
+#include "base/time.h"
 #include "webkit/fileapi/file_system_callback_dispatcher.h"
 
 namespace fileapi {
@@ -125,6 +126,19 @@
       &FileSystemOperation::DidFinishFileOperation));
 }
 
+void FileSystemOperation::TouchFile(const FilePath& path,
+                                    const base::Time& last_access_time,
+                                    const base::Time& last_modified_time) {
+#ifndef NDEBUG
+  DCHECK(!operation_pending_);
+  operation_pending_ = true;
+#endif
+
+  base::FileUtilProxy::Touch(
+      proxy_, path, last_access_time, last_modified_time,
+      callback_factory_.NewCallback(&FileSystemOperation::DidTouchFile));
+}
+
 void FileSystemOperation::DidCreateFileExclusive(
     base::PlatformFileError rv,
     base::PassPlatformFile file,
@@ -194,4 +208,11 @@
     dispatcher_->DidFail(rv);
 }
 
+void FileSystemOperation::DidTouchFile(base::PlatformFileError rv) {
+  if (rv == base::PLATFORM_FILE_OK)
+    dispatcher_->DidSucceed();
+  else
+    dispatcher_->DidFail(rv);
+}
+
 }  // namespace fileapi