Add UpdateOperationTest for drive::file_system::UpdateOperationTest.

chrome/browser/chromeos/drive/file_system/operation_test_base.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_OPERATION_TEST_BASE_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_OPERATION_TEST_BASE_H_
 
 #include <set>
 
 #include "base/files/scoped_temp_dir.h"
@@ skipping 50 matching lines @@
     std::set<base::FilePath> changed_paths_;
   };
 
   OperationTestBase();
   virtual ~OperationTestBase();
 
   // testing::Test overrides.
   virtual void SetUp() OVERRIDE;
   virtual void TearDown() OVERRIDE;
 
+  // Returns the path of the temporary directory for putting test files.
+  base::FilePath temp_dir() const { return temp_dir_.path(); }
+
   // Synchronously gets the resource entry corresponding to the path from local
   // ResourceMetadta.
   FileError GetLocalResourceEntry(const base::FilePath& path,
                                   ResourceEntry* entry);
 
   // Accessors for the components.
   google_apis::FakeDriveService* fake_service() {
     return fake_drive_service_.get();
   }
   LoggingObserver* observer() { return &observer_; }
@@ skipping 17 matching lines @@
   scoped_ptr<internal::ResourceMetadata, test_util::DestroyHelperForTests>
       metadata_;
   scoped_ptr<FakeFreeDiskSpaceGetter> fake_free_disk_space_getter_;
   scoped_ptr<internal::FileCache, test_util::DestroyHelperForTests> cache_;
 };
 
 }  // namespace file_system
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_OPERATION_TEST_BASE_H_