UX updates for notif history

- no relative time
- fix background color in dark theme
- fix text alignment in RTL

Test: manual
Bug: 160061165
Bug: 160388261
Bug: 154795795
Change-Id: I7d4c5a5f81ce5b5ce43fdaa3ee99184906753a76

res/layout/notification_history_app_layout.xml

@@ -55,7 +55,8 @@
                 android:layout_height="wrap_content"
                 android:layout_width="wrap_content"
                 android:paddingStart="6dp"
-                android:layout_gravity="center_vertical"
+                android:layout_gravity="start|center_vertical"
+                android:textDirection="locale"
                 android:paddingTop="8dp"
                 android:textAppearance="@*android:style/TextAppearance.DeviceDefault.Notification.Title"/>
         </LinearLayout>

res/layout/notification_sbn_log_row.xml

@@ -130,6 +130,6 @@
     <View
         android:id="@+id/divider"
         android:layout_width="match_parent"
-        android:layout_height="0.5dp"
-        android:background="@color/material_grey_300" />
+        android:layout_height="wrap_content"
+        android:background="?android:attr/listDivider" />
 </LinearLayout>

res/values-night/colors.xml

@@ -27,6 +27,7 @@
     <color name="notification_importance_selection_bg">@*android:color/material_grey_800</color>
     <color name="notification_importance_button_selected">#AECBFA</color> <!-- material blue 200 -->
     <color name="notification_importance_button_unselected">#5F6368</color>
+    <color name="notification_history_background">#202124</color>
     <color name="face_intro_outline">?android:attr/colorAccent</color>
     <!-- Palette list preference colors. -->
     <color name="palette_list_gradient_background">@android:color/black</color>

res/values/colors.xml

@@ -129,6 +129,7 @@
     <color name="notification_importance_button_unselected">#DADCE0</color>
     <color name="notification_importance_button_selected">#1967D2</color> <!-- material blue 700 -->
     <color name="notification_importance_selection_bg">#FFFFFF</color>
+    <color name="notification_history_background">?android:attr/colorBackgroundFloating</color>
 
     <!-- launcher icon color -->
     <color name="icon_launcher_setting_color">@*android:color/accent_device_default_light</color>

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

@@ -33,7 +33,6 @@ public class NotificationHistoryViewHolder extends RecyclerView.ViewHolder {
     NotificationHistoryViewHolder(View itemView) {
         super(itemView);
         mTime = itemView.findViewById(R.id.timestamp);
-        mTime.setShowRelativeTime(true);
         mTitle = itemView.findViewById(R.id.title);
         mSummary = itemView.findViewById(R.id.text);
     }