Show history of battery level.

Also clean up to remove dead code for running services and old
battery usage UI.

Finally some string improvements from Roy.

Change-Id: I8765a4c744b92edd1505f14c47fea57b918e5d7b

res/layout/preference_batteryhistory.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2010 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<com.android.settings.fuelgauge.BatteryHistoryChart
+        xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:minHeight="?android:attr/listPreferredItemHeight"
+    android:gravity="center_vertical"
+    android:id="@+android:id/battery_history_chart"
+    android:paddingRight="?android:attr/scrollbarSize"
+    android:textAppearance="?android:attr/textAppearanceMedium"
+    android:shadowRadius="4"
+    android:shadowColor="?android:attr/colorBackground"
+    android:shadowDx="2"
+    android:shadowDy="2">
+</com.android.settings.fuelgauge.BatteryHistoryChart>