Implement initialization for GDataCache to use in-memory metadata for tests.
Use the in-memory version for GDataFileSystemTest.


BUG=137945
TEST=unit_tests   --gtest_filter='GDataFileSystemTest*'

Review URL: https://chromiumcodereview.appspot.com/10830181

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151013 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/chromeos/gdata/gdata_cache.h b/chrome/browser/chromeos/gdata/gdata_cache.h
index c9eb8d4..2c67f0e 100644
--- a/chrome/browser/chromeos/gdata/gdata_cache.h
+++ b/chrome/browser/chromeos/gdata/gdata_cache.h
@@ -272,6 +272,9 @@
   // Utility method to call Initialize on UI thread.
   void RequestInitializeOnUIThread();
 
+  // Utility method to call InitializeForTesting on UI thread.
+  void RequestInitializeOnUIThreadForTesting();
+
   // Force a rescan of cache files, for testing.
   void ForceRescanOnUIThreadForTesting();
 
@@ -329,6 +332,10 @@
   // Initializes the cache.
   void Initialize();
 
+  // Initializes the cache with in-memory cache for testing.
+  // The in-memory cache is used since it's faster than the db.
+  void InitializeForTesting();
+
   // Deletes the cache.
   void Destroy();