Add infrastructure for accessing "unstable" content providers.

We have an API and some stuff that purports to this, but no real
implementation yet.

Change-Id: I93555440014a50fdf79fa3f65318d90fb82265b4
diff --git a/test-runner/src/android/test/mock/MockContentResolver.java b/test-runner/src/android/test/mock/MockContentResolver.java
index 6c91f4e..65eb21b 100644
--- a/test-runner/src/android/test/mock/MockContentResolver.java
+++ b/test-runner/src/android/test/mock/MockContentResolver.java
@@ -106,6 +106,18 @@
         return true;
     }
 
+    /** @hide */
+    @Override
+    protected IContentProvider acquireUnstableProvider(Context c, String name) {
+        return acquireProvider(c, name);
+    }
+
+    /** @hide */
+    @Override
+    public boolean releaseUnstableProvider(IContentProvider icp) {
+        return releaseProvider(icp);
+    }
+
     /**
      * Overrides {@link android.content.ContentResolver#notifyChange(Uri, ContentObserver, boolean)
      * ContentResolver.notifChange(Uri, ContentObserver, boolean)}. All parameters are ignored.