Update accessibility content description for battery usage chart view.

- Add battery level percentage description.

Bug: 317000579
Test: make RunSettingsRoboTests ROBOTEST_FILTER="com.android.settings.fuelgauge.batteryusage.*"
Change-Id: I03c8a97c521997170cbd72b7e0fcc88f7eb97221

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

@@ -784,10 +784,16 @@ public class BatteryChartView extends AppCompatImageView implements View.OnClick
             }
             final AccessibilityNodeInfo childInfo =
                     new AccessibilityNodeInfo(BatteryChartView.this, index);
+            final String slotTimeInfo = mViewModel.getFullText(index);
+            final String batteryLevelInfo = mViewModel.getSlotBatteryLevelText(index);
             onInitializeAccessibilityNodeInfo(childInfo);
             childInfo.setClickable(isValidToDraw(mViewModel, index));
-            childInfo.setText(mViewModel.getFullText(index));
-            childInfo.setContentDescription(mViewModel.getFullText(index));
+            childInfo.setText(slotTimeInfo);
+            childInfo.setContentDescription(
+                    mContext.getString(
+                            R.string.battery_usage_time_info_and_battery_level,
+                            slotTimeInfo,
+                            batteryLevelInfo));
 
             final Rect bounds = new Rect();
             getBoundsOnScreen(bounds, true);