Implements additional battery info menu behavior.

This is a manual cherry-pick of commit
6a43a06cac.

Bug: 33352540
Test: Updated existing tests.
Change-Id: I990029d2ea9032301362d614959259965b8ecb10

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

@@ -16,10 +16,20 @@
 
 package com.android.settings.fuelgauge;
 
+import android.content.Intent;
+
 /**
  * Feature Provider used in power usage
  */
 public interface PowerUsageFeatureProvider {
 
+  /**
+   * Check whether additional battery info feature is enabled.
+   */
   boolean isAdditionalBatteryInfoEnabled();
+
+  /**
+   * Gets an {@link Intent} to show additional battery info.
+   */
+  Intent getAdditionalBatteryInfoIntent();
 }