Support accessibility for battery usage in U (2)

Fix b/248406644 TalkBack announce the incorrect day of the week for the Battery usage chart.

Request accessibility focus in mHandler.post() to avoid UI timing unsync.

Bug: 248406644
Fix: 248406644
Test: manual
Change-Id: I866cbba670e1bc4735088663241b1aad4d2f9c86

src/com/android/settings/fuelgauge/batteryusage/BatteryUsageBreakdownController.java

@@ -199,7 +199,9 @@ public class BatteryUsageBreakdownController extends BasePreferenceController
                 : mPrefContext.getString(
                         R.string.battery_usage_breakdown_title_for_slot, slotTimestamp));
         mRootPreference.setVisible(true);
-        mRootPreference.requestAccessibilityFocus();
+        mHandler.post(() -> {
+            mRootPreference.requestAccessibilityFocus();
+        });
     }
 
     private void showFooterPreference(boolean isAllBatteryUsageEmpty, String slotTimestamp) {