Implementation for getPhoneAccountHandleForSubscriptionId method.

Test: Manual
Bug: 128916238
Change-Id: If3e6a217168d8e49128d41a74ea316d774e5ec02
diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index ca93961..d14939b 100755
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -21,6 +21,7 @@
 import static com.android.internal.telephony.PhoneConstants.SUBSCRIPTION_KEY;
 
 import android.Manifest.permission;
+import android.annotation.Nullable;
 import android.app.AppOpsManager;
 import android.app.PendingIntent;
 import android.content.ComponentName;
@@ -5301,6 +5302,20 @@
         }
     }
 
+    @Override
+    public @Nullable PhoneAccountHandle getPhoneAccountHandleForSubscriptionId(int subscriptionId) {
+        final long identity = Binder.clearCallingIdentity();
+        try {
+            Phone phone = getPhone(subscriptionId);
+            if (phone == null) {
+                return null;
+            }
+            return PhoneUtils.makePstnPhoneAccountHandle(phone);
+        } finally {
+            Binder.restoreCallingIdentity(identity);
+        }
+    }
+
     /**
      * @return the VoWiFi calling availability.
      */