Adding checkAuthentication to BrowserIDIdentities.

This does no syncing if the user is authenticated.

browserid/static/dialog/resources/browserid-identities.js

@@ -263,6 +263,23 @@ var BrowserIDIdentities = (function() {
       }
     },
 
+    /**
+     * Check whether the current user is authenticated.
+     * @method checkAuthentication
+     * @param {function} [onSuccess] - Called when check is complete with one 
+     * boolean parameter, authenticated.  authenticated will be true if user is 
+     * authenticated, false otw.
+     * @param {function} [onFailure] - Called on failure.
+     */
+    checkAuthentication: function(onSuccess, onFailure) {
+      network.checkAuth(function(authenticated) {
+        setAuthenticationStatus(authenticated);
+        if (onSuccess) {
+          onSuccess(authenticated);
+        }
+      }, onFailure);
+    },
+
     /**
      * Check whether the current user is authenticated.  If authenticated, sync 
      * identities.

browserid/static/dialog/test/qunit/browserid-identities_unit_test.js

@@ -253,12 +253,35 @@ steal.plugins("jquery", "funcunit/qunit").then("/dialog/resources/browserid-iden
   });
 
 
+  test("checkAuthentication with valid authentication", function() {
+    credentialsValid = true;
+    BrowserIDIdentities.checkAuthentication(function(authenticated) {
+      equal(authenticated, true, "We are authenticated!");
+      start();
+    });
+
+    stop();
+  });
+
+
+
+  test("checkAuthentication with invalid authentication", function() {
+    credentialsValid = false;
+    BrowserIDIdentities.checkAuthentication(function(authenticated) {
+      equal(authenticated, false, "We are not authenticated!");
+      start();
+    });
+
+    stop();
+  });
+
+
 
   test("checkAuthenticationAndSync with valid authentication", function() {
     credentialsValid = true;
     BrowserIDIdentities.checkAuthenticationAndSync(function onSuccess() {},
     function onComplete(authenticated) {
-      ok(authenticated, true, "We are authenticated!");
+      equal(authenticated, true, "We are authenticated!");
       start();
     });