expose the instant app installer component

Bug: 35873804
Test: TreeHugger
Change-Id: I4d962927587bb10833bfe3c3db27fdceab668fc3
diff --git a/core/java/android/app/ApplicationPackageManager.java b/core/java/android/app/ApplicationPackageManager.java
index a6838f8b..e07b7e4 100644
--- a/core/java/android/app/ApplicationPackageManager.java
+++ b/core/java/android/app/ApplicationPackageManager.java
@@ -2639,4 +2639,13 @@
             throw e.rethrowAsRuntimeException();
         }
     }
+
+    @Override
+    public ComponentName getInstantAppInstallerComponent() {
+        try {
+            return mPM.getInstantAppInstallerComponent();
+        } catch (RemoteException e) {
+            throw e.rethrowAsRuntimeException();
+        }
+    }
 }