Add ability to speak to provider for enhanced estimate

Added code that checks if the provider for the enhanced battery
drain estimate is available. If it is available we use that
value instead of the one computed by BatteryStats.

Test: Robotests
Bug: 37753227
Change-Id: I7eae01b56f85d33eafc42ee0f18bb752779581b2

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

@@ -19,6 +19,8 @@ package com.android.settings.fuelgauge;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
+import android.database.Cursor;
+import android.net.Uri;
 import android.os.Process;
 import com.android.internal.os.BatterySipper;
 import com.android.internal.util.ArrayUtils;
@@ -89,4 +91,24 @@ public class PowerUsageFeatureProviderImpl implements PowerUsageFeatureProvider
     public boolean isAnomalyDetectionEnabled() {
         return false;
     }
+
+    @Override
+    public long getEnhancedBatteryPrediction(Context context) {
+        return -1;
+    }
+
+    @Override
+    public boolean isEnhancedBatteryPredictionEnabled(Context context) {
+        return false;
+    }
+
+    @Override
+    public Uri getEnhancedBatteryPredictionUri() {
+        return null;
+    }
+
+    @Override
+    public long getTimeRemainingEstimate(Cursor cursor) {
+        return 0;
+    }
 }