Add kill-switch to distinguish chart or non-chart design

Bug: 184807417
Bug: 180607918
Test: make SettingsRoboTests
Test: make SettingsGoogleRoboTests
Change-Id: Iacbb012209d552b58b774f90f5b0aeb60ce6d33d

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

@@ -74,7 +74,9 @@ public class BatteryChartView extends AppCompatImageView implements View.OnClick
     public BatteryChartView(Context context, AttributeSet attrs) {
         super(context, attrs);
         initializeColors(context);
+        // Registers the click event listener.
         setOnClickListener(this);
+        setClickable(false);
         setSelectedIndex(SELECTED_INDEX_ALL);
         setTrapezoidCount(DEFAULT_TRAPEZOID_COUNT);
     }