Build a bridge to control whether the graph is clickable or not

Create a bridge to read phenotype flag from GoogleSettings to control
whether each time slot in the graph is clickable or not.

Bug: 185308803
Test: make SettingsRoboTests
Change-Id: If8b58dcaa50ad5fb6b447ca5b7146639ee31a9df

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

@@ -132,6 +132,11 @@ public interface PowerUsageFeatureProvider {
      */
     boolean isChartGraphEnabled(Context context);
 
+    /**
+     * Checks whether we should show usage information by slots or not.
+     */
+    boolean isChartGraphSlotsEnabled(Context context);
+
     /**
      * Returns battery history data with corresponding timestamp key.
      */