Add cr_scrollable_behavior tests

chrome/test/data/webui/cr_elements/cr_elements_browsertest.js

Index: chrome/test/data/webui/cr_elements/cr_elements_browsertest.js
diff --git a/chrome/test/data/webui/cr_elements/cr_elements_browsertest.js b/chrome/test/data/webui/cr_elements/cr_elements_browsertest.js
index 1fcc2225f3cfa25392e7294adfffcc6f965c5c19..0a68f913ffb15c1564a8662e0264a3a8d979bacb 100644
--- a/chrome/test/data/webui/cr_elements/cr_elements_browsertest.js
+++ b/chrome/test/data/webui/cr_elements/cr_elements_browsertest.js
@@ -132,3 +132,21 @@ CrElementsDrawerTest.prototype = {
 TEST_F('CrElementsDrawerTest', 'All', function() {
   mocha.run();
 });
+

[Dan Beam, 2017/02/03 22:29:00]

nit: @constructor and associated copy pasta

[stevenjb, 2017/02/04 00:37:24]

This was missing form all of the tests in this file; added.

+function CrElementsScrollableBehaviorTest() {}
+
+CrElementsScrollableBehaviorTest.prototype = {
+  __proto__: CrElementsBrowserTest.prototype,
+
+  /** @override */
+  browsePreload: 'chrome://resources/cr_elements/cr_scrollable_behavior.html',
+
+  /** @override */
+  extraLibraries: CrElementsBrowserTest.prototype.extraLibraries.concat([
+    'cr_scrollable_behavior_tests.js',
+  ]),
+};
+
+TEST_F('CrElementsScrollableBehaviorTest', 'All', function() {
+  mocha.run();
+});