Add uid data even though on battery stats

Advacned battery page doesn't show background toggle because it
doesn't get uid from battery stats. This cl make it get uid by
package name even though without battery stats.

Bug: 64049162
Test: RunSettingsRoboTests
Change-Id: Ie0f67ce9d080c02763a8382740e0640a66ce6053

tests/robotests/src/com/android/settings/fuelgauge/AdvancedPowerUsageDetailTest.java

@@ -368,6 +368,16 @@ public class AdvancedPowerUsageDetailTest {
                 "0%");
     }
 
+    @Test
+    public void testStartBatteryDetailPage_batteryEntryNotExisted_extractUidFromPackageName() throws
+            PackageManager.NameNotFoundException{
+        doReturn(UID).when(mPackageManager).getPackageUid(PACKAGE_NAME[0], 0 /* no flag */);
+
+        AdvancedPowerUsageDetail.startBatteryDetailPage(mTestActivity, null, PACKAGE_NAME[0]);
+
+        assertThat(mBundle.getInt(AdvancedPowerUsageDetail.EXTRA_UID)).isEqualTo(UID);
+    }
+
     @Test
     public void testStartBatteryDetailPage_defaultPackageNull_chooseFromBatterySipper() {
         mBatteryEntry.defaultPackageName = null;