chore(build): improve reliability of the saucelabs job

Closes #4091
Closes #4047

modules/angular2/src/test_lib/test_lib.ts

@@ -2,12 +2,13 @@
 
 import {DOM} from 'angular2/src/core/dom/dom_adapter';
 import {StringMapWrapper} from 'angular2/src/core/facade/collection';
-import {global, isFunction} from 'angular2/src/core/facade/lang';
+import {global, isFunction, Math} from 'angular2/src/core/facade/lang';
 import {NgZoneZone} from 'angular2/src/core/zone/ng_zone';
 
 import {bind} from 'angular2/src/core/di';
 
 import {createTestInjector, FunctionWithParamTokens, inject} from './test_injector';
+import {browserDetection} from './utils';
 
 export {inject} from './test_injector';
 
@@ -52,6 +53,7 @@ var jsmXIt = _global.xit;
 
 var runnerStack = [];
 var inIt = false;
+var globalTimeOut = browserDetection.isSlow ? 3000 : jasmine.DEFAULT_TIMEOUT_INTERVAL;
 
 var testBindings;
 
@@ -130,8 +132,9 @@ export function beforeEachBindings(fn): void {
 }
 
 function _it(jsmFn: Function, name: string, testFn: FunctionWithParamTokens | AnyTestFn,
-             timeOut: number): void {
+             testTimeOut: number): void {
   var runner = runnerStack[runnerStack.length - 1];
+  var timeOut = Math.max(globalTimeOut, testTimeOut);
 
   if (testFn instanceof FunctionWithParamTokens) {
     // The test case uses inject(). ie `it('test', inject([AsyncTestCompleter], (async) => { ...

modules/angular2/src/test_lib/utils.ts

@@ -51,6 +51,12 @@ export class BrowserDetection {
     return this._ua.indexOf('AppleWebKit') > -1 && this._ua.indexOf('Edge') == -1;
   }
 
+  get isIOS7(): boolean {
+    return this._ua.indexOf('iPhone OS 7') > -1 || this._ua.indexOf('iPad OS 7') > -1;
+  }
+
+  get isSlow(): boolean { return this.isAndroid || this.isIE || this.isIOS7; }
+
   // The Intl API is only properly supported in recent Chrome and Opera.
   // Note: Edge is disguised as Chrome 42, so checking the "Edge" part is needed,
   // see https://msdn.microsoft.com/en-us/library/hh869301(v=vs.85).aspx