drive: Support offline file creation

chrome/browser/chromeos/drive/file_system/get_file_for_saving_operation_unittest.cc

 // Copyright 2013 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/drive/file_system/get_file_for_saving_operation.h"
 
 #include "base/callback.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/run_loop.h"
@@ skipping 22 matching lines @@
   const std::string& observerd_local_id() const {
     return observed_local_id_;
   }
 
   // OperationObserver overrides.
   virtual void OnDirectoryChangedByOperation(
       const base::FilePath& path) OVERRIDE {}
 
   virtual void OnEntryUpdatedByOperation(const std::string& local_id) OVERRIDE {
     observed_local_id_ = local_id;
-    quit_closure_.Run();
+    if (!quit_closure_.is_null())

[hashimoto, 2014/01/30 04:25:51]

This null check is needed because CreateFileOpreration starts notifying this
event in this change.

+      quit_closure_.Run();
   }
 
  private:
   std::string observed_local_id_;
   base::Closure quit_closure_;
 };
 
 }  // namespace
 
 class GetFileForSavingOperationTest : public OperationTestBase {
@@ skipping 101 matching lines @@
       google_apis::test_util::CreateCopyResultCallback(
           &error, &local_path, &entry));
   test_util::RunBlockingPoolTask();
 
   // Checks that an error is returned.
   EXPECT_EQ(FILE_ERROR_EXISTS, error);
 }
 
 }  // namespace file_system
 }  // namespace drive