Fix Arc integration test.

chrome/browser/chromeos/arc/arc_util.h

Index: chrome/browser/chromeos/arc/arc_util.h
diff --git a/chrome/browser/chromeos/arc/arc_util.h b/chrome/browser/chromeos/arc/arc_util.h
index bde8bbcccb9790e32ca1b3d2d55dd37595f61e2b..deaf62966fbdef31b57ed55ec95ae0e2bd4ab7f2 100644
--- a/chrome/browser/chromeos/arc/arc_util.h
+++ b/chrome/browser/chromeos/arc/arc_util.h
@@ -31,6 +31,12 @@ bool IsArcAllowedForProfile(const Profile* profile);
 // case.
 void DisallowArcForTesting();
 
+// Sets ARC as allowed for sync test.
+// In sync test, mutilpe ArcAppListPrefs are created and can confuse
+// ArcSessionManager. Let IsArcAllowedForProfile() return true to stop confusing
+// ArcSessionManager.
+void SetArcAllowedForSyncTesting();

[hidehiko, 2017/02/24 18:22:26]

I commented alternative approach, which this may not be needed.
If you need to keep this kind of function, could you merge with
DisallowArcForTesting()? E.g. SetArcAllowedForTesting(bool allowed).

[lgcheng, 2017/02/25 01:40:38]

Done.

+
 // Returns whether the user has opted in (or is opting in now) to use Google
 // Play Store on ARC.
 // This is almost equivalent to the value of "arc.enabled" preference. However,