Raise timeouts on smooth scroll layout tests.

third_party/WebKit/LayoutTests/resources/js-test.js

Index: third_party/WebKit/LayoutTests/resources/js-test.js
diff --git a/third_party/WebKit/LayoutTests/resources/js-test.js b/third_party/WebKit/LayoutTests/resources/js-test.js
index 77b85c369afad00928e5247f88baeb045c307412..9483c358c28ca4bd0d139f98aa8e78b366679191 100644
--- a/third_party/WebKit/LayoutTests/resources/js-test.js
+++ b/third_party/WebKit/LayoutTests/resources/js-test.js
@@ -15,10 +15,10 @@ if (self.testRunner) {
 var isJsTest = true;
 
 var description, debug, successfullyParsed, getOrCreateTestElement;
-
 var expectingError; // set by shouldHaveError()
 var expectedErrorMessage; // set by onerror when expectingError is true
 var unexpectedErrorMessage; // set by onerror when expectingError is not true
+var defaultTimeoutForShouldBecome = self.defaultTimeoutForShouldBecome || 500;
 
 (function() {
 
@@ -280,7 +280,7 @@ function shouldBecomeEqual(_a, _b, _completionHandler, _timeout)
     debug("WARN: shouldBecomeEqual() expects string arguments");
 
   if (_timeout === undefined)
-    _timeout = 500;
+    _timeout = defaultTimeoutForShouldBecome;
 
   var _bv;
   var _condition = function() {
@@ -413,7 +413,7 @@ function shouldBecomeDifferent(_a, _b, _completionHandler, _timeout)
   if (typeof _a != "string" || typeof _b != "string")
     debug("WARN: shouldBecomeDifferent() expects string arguments");
   if (_timeout === undefined)
-    _timeout = 500;
+    _timeout = defaultTimeoutForShouldBecome;
 
   var _bv;
   var _condition = function() {