Add methods to mock JS clock to Jasmine wrapper

jasmine-test-framework/src/main/scala/org/scalajs/jasmine/Jasmine.scala

@@ -3,6 +3,7 @@ package org.scalajs.jasmine
 import scala.scalajs.js
 
 object Jasmine extends js.GlobalScope {
+  def jasmine: JasmineEnv = ???
   def describe(name: String, suite: js.Function0[_]): Unit = ???
   def it(title: String, test: js.Function0[_]): Unit = ???
   def xdescribe(name: String, suite: js.Function0[_]): Unit = ???

jasmine-test-framework/src/main/scala/org/scalajs/jasmine/JasmineEnv.scala

@@ -0,0 +1,14 @@
+package org.scalajs.jasmine
+
+import scala.scalajs.js
+
+trait JasmineEnv extends js.Object {
+  def Clock: JasmineEnv.Clock
+}
+
+object JasmineEnv {
+  trait Clock extends js.Object {
+    def tick(time: js.Number): js.Undefined
+    def useMock(): js.Undefined
+  }
+}

jasmine-test-framework/src/main/scala/scala/scalajs/test/JasmineTest.scala

@@ -15,6 +15,7 @@ import org.scalajs.jasmine.Jasmine
 import org.scalajs.jasmine.JasmineExpectation
 
 class JasmineTest extends Test {
+  def jasmine = Jasmine.jasmine
   def describe(name: String)(suite: => Unit): Unit = Jasmine.describe(name, suite _)
   def it(title: String)(test: => Unit): Unit = Jasmine.it(title, test _)
   def xdescribe(name: String)(suite: => Unit): Unit = Jasmine.xdescribe(name, suite _)