Break into a setTimeout every once in a while

- Allows the CPU to run other things that used the real `setTimeout`

- Fixes #1327
- See #1334
- Fixes jasmine/gulp-jasmine-browser#48

src/core/ClearStack.js

@@ -1,5 +1,7 @@
 getJasmineRequireObj().clearStack = function(j$) {
-  function messageChannelImpl(global) {
+  var maxInlineCallCount = 10;
+
+  function messageChannelImpl(global, setTimeout) {
     var channel = new global.MessageChannel(),
         head = {},
         tail = head;
@@ -22,25 +24,43 @@ getJasmineRequireObj().clearStack = function(j$) {
       }
     };
 
+    var currentCallCount = 0;
     return function clearStack(fn) {
-      tail = tail.next = { task: fn };
-      channel.port2.postMessage(0);
+      currentCallCount++;
+
+      if (currentCallCount < maxInlineCallCount) {
+        tail = tail.next = { task: fn };
+        channel.port2.postMessage(0);
+      } else {
+        setTimeout(fn);
+      }
     };
   }
 
   function getClearStack(global) {
+    var currentCallCount = 0;
+    var realSetTimeout = global.setTimeout;
+    var setTimeoutImpl = function clearStack(fn) {
+        Function.prototype.apply.apply(realSetTimeout, [global, [fn, 0]]);
+    };
+
     if (j$.isFunction_(global.setImmediate)) {
       var realSetImmediate = global.setImmediate;
       return function(fn) {
-        realSetImmediate(fn);
+        currentCallCount++;
+
+        if (currentCallCount < maxInlineCallCount) {
+          realSetImmediate(fn);
+        } else {
+          currentCallCount = 0;
+
+          setTimeoutImpl(fn);
+        }
       };
     } else if (!j$.util.isUndefined(global.MessageChannel)) {
-      return messageChannelImpl(global);
+      return messageChannelImpl(global, setTimeoutImpl);
     } else {
-      var realSetTimeout = global.setTimeout;
-      return function clearStack(fn) {
-        Function.prototype.apply.apply(realSetTimeout, [global, [fn, 0]]);
-      };
+      return setTimeoutImpl;
     }
   }