Revamp the battery usage details page.

This cl adds AdvancedPowerUsageDetail to show the usage details page.
The AdvancedPowerUsageDetail contains all the needed ui components:
1. App Header
2. Two buttons
3. Usage breakdown preference category
4. Power management preference category

This cl also adds preference controller for two buttons but the
detail implementation will be added in the following cl.

Following cl will also remove previous detail page.

Bug: 35810915
Test: RunSettingsRoboTests
Change-Id: I17f95d1288762094671c0f148fa73367e51f175e

src/com/android/settings/fuelgauge/BatteryUtils.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2017 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.
+ */
+package com.android.settings.fuelgauge;
+
+import android.annotation.IntDef;
+import android.os.BatteryStats;
+import android.os.SystemClock;
+import android.support.annotation.Nullable;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/**
+ * Utils for battery operation
+ */
+public class BatteryUtils {
+    @Retention(RetentionPolicy.SOURCE)
+    @IntDef({StatusType.FOREGROUND,
+            StatusType.BACKGROUND,
+            StatusType.ALL
+    })
+    public @interface StatusType {
+        int FOREGROUND = 0;
+        int BACKGROUND = 1;
+        int ALL = 2;
+    }
+
+    public static long getProcessTimeMs(@StatusType int type, @Nullable BatteryStats.Uid uid,
+            int which) {
+        if (uid == null) {
+            return 0;
+        }
+
+        switch (type) {
+            case StatusType.FOREGROUND:
+                return getProcessForegroundTimeMs(uid, which);
+            case StatusType.BACKGROUND:
+                return getProcessBackgroundTimeMs(uid, which);
+            case StatusType.ALL:
+                return getProcessForegroundTimeMs(uid, which)
+                        + getProcessBackgroundTimeMs(uid, which);
+        }
+        return 0;
+    }
+
+    private static long getProcessBackgroundTimeMs(BatteryStats.Uid uid, int which) {
+        final long rawRealTimeUs = convertMsToUs(SystemClock.elapsedRealtime());
+        final long timeUs = uid.getProcessStateTime(
+                BatteryStats.Uid.PROCESS_STATE_BACKGROUND, rawRealTimeUs, which);
+        return  convertUsToMs(timeUs);
+    }
+
+    private static long getProcessForegroundTimeMs(BatteryStats.Uid uid, int which) {
+        final long rawRealTimeUs = convertMsToUs(SystemClock.elapsedRealtime());
+        final int foregroundTypes[] = {BatteryStats.Uid.PROCESS_STATE_TOP,
+                BatteryStats.Uid.PROCESS_STATE_FOREGROUND_SERVICE,
+                BatteryStats.Uid.PROCESS_STATE_TOP_SLEEPING,
+                BatteryStats.Uid.PROCESS_STATE_FOREGROUND};
+        long timeUs = 0;
+        for (int type : foregroundTypes) {
+            timeUs += uid.getProcessStateTime(type, rawRealTimeUs, which);
+        }
+
+        return convertUsToMs(timeUs);
+    }
+
+    private static long convertUsToMs(long timeUs) {
+        return timeUs / 1000;
+    }
+
+    private static long convertMsToUs(long timeMs) {
+        return timeMs * 1000;
+    }
+
+}
+