Some more a11y fixes

Min height, and announcing button changes

Test: manual
Fixes: 152729661
Fixes: 152728211
Change-Id: I886ce046da3dd5b2b93673aee0cd5bdc37d5fc48

res/layout/notification_history_log_row.xml

@@ -26,6 +26,7 @@
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
+        android:minHeight="48dp"
         android:orientation="vertical"
         android:layout_marginBottom="6dp">
         <LinearLayout

res/layout/notification_sbn_log_row.xml

@@ -104,6 +104,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:orientation="vertical"
+        android:minHeight="48dp"
         android:layout_marginStart="30dp"
         android:layout_marginBottom="6dp"
         >

src/com/android/settings/notification/history/NotificationHistoryActivity.java

@@ -90,6 +90,7 @@ public class NotificationHistoryActivity extends Activity {
                     expand.setContentDescription(container.getVisibility() == View.VISIBLE
                             ? getString(R.string.condition_expand_hide)
                             : getString(R.string.condition_expand_show));
+                    expand.setAccessibilityLiveRegion(View.ACCESSIBILITY_LIVE_REGION_POLITE);
             });
 
             TextView label = viewForPackage.findViewById(R.id.label);