Refine fingerprint enrollment experience

- Flash fingerprint graphic when enrollment progresses
- Show hint message when not progressing for a few seconds
- Make sure animation is always working

Bug: 21617091
Bug: 21644138
Change-Id: Ic54c10a655e6da914f960cee20f0066b46d87325

res/drawable/fp_illustration_enrollment.xml

@@ -0,0 +1,36 @@
+<!--
+Copyright (C) 2015 The Android Open Source Project
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="88.0dp"
+        android:height="88.0dp"
+        android:viewportWidth="88.0"
+        android:viewportHeight="88.0">
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+        android:fillColor="#FF000000"
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+        android:fillColor="#FF000000"
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+        android:fillColor="#FF000000"
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+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M55.92,87.75c-0.23,0.0 -0.46,-0.03 -0.7,-0.1c-6.6,-1.91 -10.92,-4.49 -15.4,-9.2c-5.76,-6.06 -8.94,-14.13 -8.94,-22.72c0.0,-7.2 5.86,-13.05 13.05,-13.05c7.2,0.0 13.05,5.86 13.05,13.05c0.0,4.44 3.61,8.05 8.05,8.05s8.05,-3.61 8.05,-8.05c0.0,-16.08 -13.08,-29.16 -29.16,-29.16c-11.43,0.0 -21.86,6.73 -26.58,17.15c-1.57,3.48 -2.37,7.52 -2.37,12.01c0.0,3.36 0.28,8.62 2.71,15.49c0.46,1.3 -0.22,2.73 -1.52,3.19c-1.3,0.46 -2.73,-0.22 -3.19,-1.52c-2.02,-5.7 -3.0,-11.31 -3.0,-17.16c0.0,-5.21 0.95,-9.94 2.82,-14.07c5.52,-12.2 17.74,-20.09 31.13,-20.09c18.83,0.0 34.16,15.32 34.16,34.16c0.0,7.2 -5.86,13.05 -13.05,13.05S52.0,62.92 52.0,55.73c0.0,-4.44 -3.61,-8.05 -8.05,-8.05s-8.05,3.61 -8.05,8.05c0.0,7.3 2.69,14.15 7.56,19.28c3.86,4.06 7.43,6.18 13.17,7.84c1.33,0.38 2.09,1.77 1.71,3.1C58.01,87.04 57.01,87.75 55.92,87.75z"/>
+</vector>