Refactor suite timing out of Env and into each Reporter

[finishes #45659879]

src/core/JsApiReporter.js

@@ -1,21 +1,28 @@
 getJasmineRequireObj().JsApiReporter = function() {
-  function JsApiReporter(jasmine) {  // TODO: this doesn't appear to be used
-    this.jasmine = jasmine || {};
+
+  var noopTimer = {
+    start: function(){},
+    elapsed: function(){ return 0; }
+  };
+
+  function JsApiReporter(options) {
+    var timer = options.timer || noopTimer,
+        status = "loaded";
+
     this.started = false;
     this.finished = false;
 
-    var status = 'loaded';
-
     this.jasmineStarted = function() {
       this.started = true;
       status = 'started';
+      timer.start();
     };
 
     var executionTime;
 
-    this.jasmineDone = function(options) {
+    this.jasmineDone = function() {
       this.finished = true;
-      executionTime = options.executionTime;
+      executionTime = timer.elapsed();
       status = 'done';
     };
 

src/core/Timer.js

@@ -0,0 +1,18 @@
+getJasmineRequireObj().Timer = function() {
+  function Timer(options) {
+    options = options || {};
+
+    var now = options.now || function() { return new Date().getTime(); },
+        startTime;
+
+    this.start = function() {
+      startTime = now();
+    };
+
+    this.elapsed = function() {
+      return now() - startTime;
+    };
+  }
+
+  return Timer;
+};

src/core/requireCore.js

@@ -28,6 +28,7 @@ getJasmineRequireObj().core = function(jRequire) {
   j$.Spec = jRequire.Spec();
   j$.Spy = jRequire.Spy(j$);
   j$.Suite = jRequire.Suite();
+  j$.Timer = jRequire.Timer();
   j$.version = jRequire.version();
 
   j$.matchers = jRequire.requireMatchers(jRequire, j$);