Subclassable TestCallbackHelperContainer constructor for tests.

BUG=161941
TEST=No visible functionality changes.


Review URL: https://chromiumcodereview.appspot.com/11280239

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170455 0039d316-1c4b-4281-b951-d872f2087c98

content/public/test/android/javatests/src/org/chromium/content/browser/test/util/TestCallbackHelperContainer.java

@@ -23,6 +23,12 @@ public class TestCallbackHelperContainer {
         mTestWebContentsObserver = new TestWebContentsObserver(contentView.getContentViewCore());
     }
 
+    protected TestCallbackHelperContainer(
+            TestContentViewClient viewClient, TestWebContentsObserver contentsObserver) {
+        mTestContentViewClient = viewClient;
+        mTestWebContentsObserver = contentsObserver;
+    }
+
     public static class OnPageFinishedHelper extends CallbackHelper {
         private String mUrl;
         public void notifyCalled(String url) {