Add emergency broadcast to app & notification settings.

Also fixed a bug where progressive disclosure expand button is displayed
incorrectly when # of preference == threshold exactly.

Change-Id: I518687e374853ae8ab1c7e5337822492d6fd99ff
Fix: 36557600
Test: robotests

tests/robotests/src/com/android/settings/dashboard/ProgressiveDisclosureTest.java

@@ -92,6 +92,15 @@ public class ProgressiveDisclosureTest {
         assertThat(mMixin.shouldCollapse(mScreen)).isFalse();
     }
 
+    @Test
+    public void shouldNotCollapse_preferenceCountSameAsThreshold() {
+        when(mScreen.getPreferenceCount()).thenReturn(5);
+
+        mMixin.setTileLimit(5);
+
+        assertThat(mMixin.shouldCollapse(mScreen)).isFalse();
+    }
+
     @Test
     public void shouldNotCollapse_whenStartAsExpanded() {
         when(mScreen.getPreferenceCount()).thenReturn(5);