cros: Added policies for screen unlock.

chrome/browser/chromeos/login/quick_unlock/pin_storage.h

Index: chrome/browser/chromeos/login/quick_unlock/pin_storage.h
diff --git a/chrome/browser/chromeos/login/quick_unlock/pin_storage.h b/chrome/browser/chromeos/login/quick_unlock/pin_storage.h
index f9fe72aadbecff1921e3716e0c1d82bf26680110..83ecc900ee1d01299b8330a5756cb4cfc6fef152 100644
--- a/chrome/browser/chromeos/login/quick_unlock/pin_storage.h
+++ b/chrome/browser/chromeos/login/quick_unlock/pin_storage.h
@@ -23,9 +23,8 @@ namespace chromeos {
 
 class PinStorage : public KeyedService {
  public:
-  // TODO(jdufault): Pull these values in from policy. See crbug.com/612271.
+  // TODO(sammiequon): Pull this value in from policy. See crbug.com/612271.

[jdufault, 2016/11/02 18:44:02]

Why not implement this now, so that we don't have to come back to it in the
future?

[sammiequon, 2016/11/02 22:00:29]

I don't see this policy on the doc, do I have to run this by Tom first? Also I'd
prefer to get this CL out quicker since it's already been a month but I can work
on this right away in a dependent CL.

[jdufault, 2016/11/02 22:52:58]

The reason I suggest doing it in this CL is to reduce churn for OWNERs, since
you're going to be touching a lot of the same files as this CL.

Feel free to run it past Tom first. I'm fine if you implement it in a different
CL.

   static const int kMaximumUnlockAttempts = 3;
-  static const base::TimeDelta kStrongAuthTimeout;
 
   // Registers profile prefs.
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);