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

chrome/browser/chromeos/gdata/gdata_cache.cc

Index: chrome/browser/chromeos/gdata/gdata_cache.cc
diff --git a/chrome/browser/chromeos/gdata/gdata_cache.cc b/chrome/browser/chromeos/gdata/gdata_cache.cc
index 3af5532639fed9812cd2012789168f589f731d85..036e33bc6e0a9cd1c041574ab76984749c5ea4a6 100644
--- a/chrome/browser/chromeos/gdata/gdata_cache.cc
+++ b/chrome/browser/chromeos/gdata/gdata_cache.cc
@@ -697,6 +697,14 @@ void GDataCache::RequestInitializeOnUIThread() {
       base::Bind(&GDataCache::Initialize, base::Unretained(this)));
 }
 
+void GDataCache::RequestInitializeOnUIThreadForTesting() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  blocking_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&GDataCache::InitializeForTesting, base::Unretained(this)));
+}
+
 void GDataCache::ForceRescanOnUIThreadForTesting() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
@@ -743,6 +751,15 @@ void GDataCache::Initialize() {
   metadata_->Initialize(cache_paths_);
 }
 
+void GDataCache::InitializeForTesting() {
+  AssertOnSequencedWorkerPool();
+
+  InitCachePaths(cache_paths_);
+  metadata_ = GDataCacheMetadata::CreateGDataCacheMetadataForTesting(
+      blocking_task_runner_).Pass();
+  metadata_->Initialize(cache_paths_);
+}
+
 void GDataCache::Destroy() {
   AssertOnSequencedWorkerPool();
   delete this;