gdata: Fix "save as pdf" to work on Google Drive.

chrome/browser/chromeos/gdata/gdata_util.cc

 // 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.
 
 #include "chrome/browser/chromeos/gdata/gdata_util.h"
 
 #include <string>
 #include <vector>
 #include <utility>
 
@@ skipping 561 matching lines @@
 
 std::string FormatTimeAsString(const base::Time& time) {
   base::Time::Exploded exploded;
   time.UTCExplode(&exploded);
   return base::StringPrintf(
       "%04d-%02d-%02dT%02d:%02d:%02d.%03dZ",
       exploded.year, exploded.month, exploded.day_of_month,
       exploded.hour, exploded.minute, exploded.second, exploded.millisecond);
 }
 
+void PrepareWritableFileAndRun(Profile* profile,
+                               const FilePath& path,
+                               const OpenFileCallback& callback) {
+  if (IsUnderGDataMountPoint(path)) {
+    FilePath remote_path(ExtractGDataPath(path));
+    GetGDataFileSystem(profile)->PrepareWritableFileAndRun(remote_path,
+                                                           callback);
+  } else {
+    if (!callback.is_null()) {
+      content::BrowserThread::GetBlockingPool()->PostTask(
+          FROM_HERE, base::Bind(callback, GDATA_FILE_OK, path));
+    }
+  }
+}
+
 }  // namespace util
 }  // namespace gdata