Add FingerprintEnroll API

Fixes: 65459785

Test: adb shell am start -a android.settings.FINGERPRINT_ENROLL
      Flow is correct with and without PIN/Pattern/Pass set up
Test: make -j56 SettingsUnitTests
      adb install -r out/target/product/walleye/data/app/SettingsUnitTests/SettingsUnitTests.apk
      adb shell am instrument -w -e class com.android.settings.fingerprint.FingerprintEnrollIntroductionTest 'com.android.settings.tests.unit/android.support.test.runner.AndroidJUnitRunner'

Change-Id: If987257943190eb91d5822e683657aea621d2206
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index f07c39f..e1d2225 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1592,7 +1592,14 @@
         <activity android:name=".fingerprint.FingerprintEnrollFindSensor" android:exported="false"/>
         <activity android:name=".fingerprint.FingerprintEnrollEnrolling" android:exported="false"/>
         <activity android:name=".fingerprint.FingerprintEnrollFinish" android:exported="false"/>
-        <activity android:name=".fingerprint.FingerprintEnrollIntroduction" android:exported="false" />
+        <activity android:name=".fingerprint.FingerprintEnrollIntroduction"
+            android:exported="true"
+            android:theme="@style/GlifTheme.Light">
+            <intent-filter>
+                <action android:name="android.settings.FINGERPRINT_ENROLL" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </activity>
 
         <activity android:name=".fingerprint.SetupFingerprintEnrollFindSensor" android:exported="false"/>
         <activity android:name=".fingerprint.SetupFingerprintEnrollEnrolling" android:exported="false"/>