Add enterprise disclosure to Keyguard screen

With this CL, a disclosure text is shown on the Keyguard screen when
a Device Owner is managing the device.

Bug: 32692748
Test: runtest --path frameworks/base/packages/SystemUI/tests

Change-Id: I7a48df7dc010c39b2db94fcd26b75313a7ceee08
diff --git a/packages/SystemUI/res/layout/keyguard_bottom_area.xml b/packages/SystemUI/res/layout/keyguard_bottom_area.xml
index 444f0f0..078f9d7 100644
--- a/packages/SystemUI/res/layout/keyguard_bottom_area.xml
+++ b/packages/SystemUI/res/layout/keyguard_bottom_area.xml
@@ -24,17 +24,36 @@
     android:outlineProvider="none"
     android:elevation="5dp" > <!-- Put it above the status bar header -->
 
-    <com.android.systemui.statusbar.phone.KeyguardIndicationTextView
-        android:id="@+id/keyguard_indication_text"
+    <LinearLayout
+        android:id="@+id/keyguard_indication_area"
+        android:forceHasOverlappingRendering="false"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_marginBottom="@dimen/keyguard_indication_margin_bottom"
         android:layout_gravity="bottom|center_horizontal"
-        android:gravity="center_horizontal"
-        android:textStyle="italic"
-        android:textColor="#ffffff"
-        android:textAppearance="?android:attr/textAppearanceSmall"
-        android:accessibilityLiveRegion="polite" />
+        android:orientation="vertical">
+
+        <com.android.systemui.statusbar.phone.KeyguardIndicationTextView
+            android:id="@+id/keyguard_indication_enterprise_disclosure"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="center_horizontal"
+            android:textStyle="italic"
+            android:textColor="#ffffff"
+            android:textAppearance="?android:attr/textAppearanceSmall"
+            android:visibility="gone" />
+
+        <com.android.systemui.statusbar.phone.KeyguardIndicationTextView
+            android:id="@+id/keyguard_indication_text"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="center_horizontal"
+            android:textStyle="italic"
+            android:textColor="#ffffff"
+            android:textAppearance="?android:attr/textAppearanceSmall"
+            android:accessibilityLiveRegion="polite" />
+
+    </LinearLayout>
 
     <FrameLayout
         android:id="@+id/preview_container"