Fix power usage detail page is launched in wrong user

Two issues:
1. UID of settings app == system UID. But isSystemUid failed to recognize
Settings in secondary user is also a system uid.
2. For USER drain type, we should launch the detail page in current
   user.

Fix: 64506728
Test: make ROBOTEST_FILTER=AdvancedPowerUsageDetailTest -j40 RunSettingsRoboTests
Test: Switch to seconday user. Go to Settings->Battery, tap owner user
      battery entry, observe that detail page is shown.
Test: Stay long enough in Settings app, make sure no
      either Settings nor Android Framework battery entry.

Change-Id: I8d66ad55f18fcb3d9567b3bf753f737f5b98c609

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

@@ -16,7 +16,9 @@
 
 package com.android.settings.fuelgauge;
 
+import android.annotation.UserIdInt;
 import android.app.Activity;
+import android.app.ActivityManager;
 import android.app.LoaderManager;
 import android.app.admin.DevicePolicyManager;
 import android.content.Context;
@@ -152,7 +154,14 @@ public class AdvancedPowerUsageDetail extends DashboardFragment implements
 
         caller.startPreferencePanelAsUser(fragment, AdvancedPowerUsageDetail.class.getName(), args,
                 R.string.battery_details_title, null,
-                new UserHandle(UserHandle.getUserId(sipper.getUid())));
+                new UserHandle(getUserIdToLaunchAdvancePowerUsageDetail(sipper)));
+    }
+
+    private static @UserIdInt int getUserIdToLaunchAdvancePowerUsageDetail(BatterySipper bs) {
+        if (bs.drainType == BatterySipper.DrainType.USER) {
+            return ActivityManager.getCurrentUser();
+        }
+        return UserHandle.getUserId(bs.getUid());
     }
 
     public static void startBatteryDetailPage(SettingsActivity caller, PreferenceFragment fragment,