Re-add Mock Clock behavior as global 'clock'

- Use clock.install, clock.tick...
- Add unit coverage.
- Fixes old bug in function scheduler

src/core/DelayedFunctionScheduler.js

@@ -0,0 +1,102 @@
+jasmine.DelayedFunctionScheduler = function() {
+  var self = this;
+  var scheduledFunctions = {};
+  var currentTime = 0;
+  var delayedFnCount = 0;
+
+  self.tick = function(millis) {
+    runFunctionsWithinRange(currentTime, currentTime + millis);
+    currentTime = currentTime + millis;
+  };
+
+  self.scheduleFunction = function(funcToCall, millis, params, recurring, timeoutKey, runAtMillis) {
+    timeoutKey = timeoutKey || ++delayedFnCount;
+    runAtMillis = runAtMillis || (currentTime + millis);
+    scheduledFunctions[timeoutKey] = {
+      runAtMillis: runAtMillis,
+      funcToCall: funcToCall,
+      recurring: recurring,
+      params: params,
+      timeoutKey: timeoutKey,
+      millis: millis
+    };
+    return timeoutKey;
+  };
+
+  self.removeFunctionWithId = function(timeoutKey) {
+    delete scheduledFunctions[timeoutKey];
+  };
+
+  self.reset = function() {
+    currentTime = 0;
+    scheduledFunctions = {};
+    delayedFnCount = 0;
+  };
+
+  return self;
+
+
+  //finds/dupes functions within range and removes them.
+  function functionsWithinRange(startMillis, endMillis) {
+    var fnsToRun = [];
+    for (var timeoutKey in scheduledFunctions) {
+      var scheduledFunc = scheduledFunctions[timeoutKey];
+      if (scheduledFunc &&
+          scheduledFunc.runAtMillis >= startMillis &&
+            scheduledFunc.runAtMillis <= endMillis) {
+        //remove fn -- we'll reschedule later if it is recurring.
+        self.removeFunctionWithId(timeoutKey);
+        if (!scheduledFunc.recurring) {
+          fnsToRun.push(scheduledFunc); // schedules each function only once
+        } else {
+          fnsToRun.push(buildNthInstanceOf(scheduledFunc, 0));
+          var additionalTimesFnRunsInRange =
+            Math.floor((endMillis - scheduledFunc.runAtMillis) / scheduledFunc.millis);
+          for (var i = 0; i < additionalTimesFnRunsInRange; i++) {
+            fnsToRun.push(buildNthInstanceOf(scheduledFunc, i + 1));
+          }
+          reschedule(buildNthInstanceOf(scheduledFunc, additionalTimesFnRunsInRange));
+        }
+      }
+    }
+
+    return fnsToRun;
+  }
+
+  function buildNthInstanceOf(scheduledFunc, n) {
+    return {
+      runAtMillis: scheduledFunc.runAtMillis + (scheduledFunc.millis * n),
+      funcToCall: scheduledFunc.funcToCall,
+      params: scheduledFunc.params,
+      millis: scheduledFunc.millis,
+      recurring: scheduledFunc.recurring,
+      timeoutKey: scheduledFunc.timeoutKey
+    };
+  }
+
+  function reschedule(scheduledFn) {
+    self.scheduleFunction(scheduledFn.funcToCall,
+      scheduledFn.millis,
+      scheduledFn.params,
+      true,
+      scheduledFn.timeoutKey,
+      scheduledFn.runAtMillis + scheduledFn.millis);
+  }
+
+
+  function runFunctionsWithinRange(startMillis, endMillis) {
+    var funcsToRun = functionsWithinRange(startMillis, endMillis);
+    if (funcsToRun.length === 0) {
+      return;
+    }
+
+    funcsToRun.sort(function(a, b) {
+      return a.runAtMillis - b.runAtMillis;
+    });
+
+    for (var i = 0; i < funcsToRun.length; ++i) {
+      var funcToRun = funcsToRun[i];
+      funcToRun.funcToCall.apply(null, funcToRun.params);
+    }
+  }
+};