Add estimated time remaining text to QS

- Add an API to BatteryController to get an estimated time remaining
string.
- BatteryController will now check up to once per minute what the
estimated time will be and builds the string using PowerUtil.
- If the "show percentage" setting is on, the estimated time remaining
string (and battery icon) will show next to the system icons in QS
- Also make the battery percent in QS obey the setting

Test: visual
Bug: 116481529
Change-Id: Iaafa00127c8b8baae40956254a1237c8b7ac079b

packages/SystemUI/res/layout/quick_qs_status_icons.xml

@@ -42,6 +42,20 @@
         android:id="@+id/statusIcons"
         android:layout_width="0dp"
         android:layout_height="match_parent"
-        android:layout_weight="1" />
+        android:layout_weight="1"
+        android:paddingEnd="@dimen/signal_cluster_battery_padding" />
+
+    <com.android.systemui.BatteryMeterView
+        android:id="@+id/batteryRemainingIcon"
+        android:layout_height="match_parent"
+        android:layout_width="wrap_content"
+        android:paddingEnd="2dp" />
+
+    <TextView
+        android:id="@+id/batteryRemainingText"
+        android:textAppearance="@style/TextAppearance.QS.TileLabel"
+        android:layout_height="match_parent"
+        android:layout_width="wrap_content"
+        android:gravity="center_vertical" />
 
 </LinearLayout>