Well control enrolling icon animation by UX design

T:
* Always plays the scanning animation when user enrolling.

QPR:
* At beginning / Orientation change: Play the scanning animation until user interact with FPS
* When progress moved : Play scanning animation once
* Error : Show message(red color) to notify user

Bug: 232018092
Test: With Rare-FPS device, Settings > Security > Fingerprint enrollment,
enrolling a new fingerprint, check the mIconAnimationDrawable
Test: With Side-FPS device, Settings > Security > Fingerprint enrollment,
enrolling a new fingerprint, check the mIconAnimationDrawable
Test:  make RunSettingsGoogleRoboTests ROBOTEST_FILTER= \
"com.google.android.settings.biometrics.fingerprint.FingerprintEnrollEnrollingTest"

Change-Id: I64a1bd24260205b651036c34e6e879b59bef75cc

src/com/android/settings/biometrics/fingerprint/FingerprintEnrollEnrolling.java

@@ -639,13 +639,17 @@ public class FingerprintEnrollEnrolling extends BiometricsEnrollEnrolling {
             new Animator.AnimatorListener() {
 
                 @Override
-                public void onAnimationStart(Animator animation) { }
+                public void onAnimationStart(Animator animation) {
+                    startIconAnimation();
+                }
 
                 @Override
                 public void onAnimationRepeat(Animator animation) { }
 
                 @Override
                 public void onAnimationEnd(Animator animation) {
+                    stopIconAnimation();
+
                     if (mProgressBar.getProgress() >= PROGRESS_BAR_MAX) {
                         mProgressBar.postDelayed(mDelayedFinishRunnable, getFinishDelay());
                     }