Create Advanced battery page

The advanced page shows two major parts, one is the battery usage
graph and the other is battery usage list. In usage list, each item
shows basic info of battery usage of one type(e.g. Apps, System)

Bug: 34385770
Test: RunSettingsRoboTests

Change-Id: I22475a489285787afa775af8d5ae3340eff1eed9

src/com/android/settings/overlay/FeatureFactoryImpl.java

@@ -37,6 +37,7 @@ import com.android.settings.enterprise.DevicePolicyManagerWrapperImpl;
 import com.android.settings.enterprise.EnterprisePrivacyFeatureProvider;
 import com.android.settings.enterprise.EnterprisePrivacyFeatureProviderImpl;
 import com.android.settings.fuelgauge.PowerUsageFeatureProvider;
+import com.android.settings.fuelgauge.PowerUsageFeatureProviderImpl;
 import com.android.settings.localepicker.LocaleFeatureProvider;
 import com.android.settings.localepicker.LocaleFeatureProviderImpl;
 import com.android.settings.search2.SearchFeatureProvider;
@@ -59,6 +60,7 @@ public class FeatureFactoryImpl extends FeatureFactory {
     private SearchFeatureProvider mSearchFeatureProvider;
     private SecurityFeatureProvider mSecurityFeatureProvider;
     private SuggestionFeatureProvider mSuggestionFeatureProvider;
+    private PowerUsageFeatureProvider mPowerUsageFeatureProvider;
 
     @Override
     public SupportFeatureProvider getSupportFeatureProvider(Context context) {
@@ -75,7 +77,10 @@ public class FeatureFactoryImpl extends FeatureFactory {
 
     @Override
     public PowerUsageFeatureProvider getPowerUsageFeatureProvider(Context context) {
-        return null;
+        if (mPowerUsageFeatureProvider == null) {
+            mPowerUsageFeatureProvider = new PowerUsageFeatureProviderImpl();
+        }
+        return mPowerUsageFeatureProvider;
     }
 
     @Override