Implement initialization for GDataCache to use in-memory metadata for tests.

chrome/browser/chromeos/gdata/gdata_cache_metadata.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_cache_metadata.h"
 
 #include <leveldb/db.h>
 
 #include "base/file_util.h"
 #include "base/sequenced_task_runner.h"
@@ skipping 572 matching lines @@
     base::SequencedTaskRunner* blocking_task_runner)
     : blocking_task_runner_(blocking_task_runner) {
   AssertOnSequencedWorkerPool();
 }
 
 GDataCacheMetadata::~GDataCacheMetadata() {
   AssertOnSequencedWorkerPool();
 }
 
 // static
 scoped_ptr<GDataCacheMetadata> GDataCacheMetadata::CreateGDataCacheMetadata(

[achuithb, 2012/08/06 23:22:20]

It may be better to write a separate function like
CreateGDataCacheMetadataForTesting instead of adding a boolean.

[satorux1, 2012/08/07 10:50:08]

agreed!

[Haruki Sato, 2012/08/08 05:00:42]

Done!

-    base::SequencedTaskRunner* blocking_task_runner) {
-  return scoped_ptr<GDataCacheMetadata>(
-      new GDataCacheMetadataDB(blocking_task_runner));
+    base::SequencedTaskRunner* blocking_task_runner, bool use_map) {
+  return use_map ?
+      scoped_ptr<GDataCacheMetadata>(
+          new GDataCacheMetadataMap(blocking_task_runner)) :
+      scoped_ptr<GDataCacheMetadata>(
+          new GDataCacheMetadataDB(blocking_task_runner));
 }
 
 void GDataCacheMetadata::AssertOnSequencedWorkerPool() {
   DCHECK(!blocking_task_runner_ ||
          blocking_task_runner_->RunsTasksOnCurrentThread());
 }
 
 }  // namespace gdata