[Blink-WebWorkers] WorkerSharedTimer cancels extra delayed tasks.

LayoutTests/fast/workers/resources/worker-timeout-order.js

+self.postMessage("Test started.");
+// The test will create timeouts in the following order
+// on first message - 1s, 2s.
+// on second message - 2s, 1s.
+// on third and final message - 3s, 2s, 1s.
+// if the timeouts in order then the test is PASS.
+self.addEventListener('message', function(e) {
+    if(e.data == "TS1") {
+        setTimeout(function () { postMessage(1); }, 100);

[jochen (gone - plz use gerrit), 2014/09/17 14:47:39]

can you use lower timeouts 5, 10, 15? so the test doesn't take unnecessarily
long

might also be a good idea to split this up into two tests (or three and add the
test I mentioned in the comment)

[Mayur Kankanwadi, 2014/09/18 14:34:25]

Done.

+        setTimeout(function () { postMessage(2); }, 200);
+        setTimeout(function () { postMessage(3); }, 300);
+    }
+    else if(e.data == "TS2") {
+        setTimeout(function () { postMessage(3); postMessage("DONE"); }, 300);
+        setTimeout(function () { postMessage(2); }, 200);
+        setTimeout(function () { postMessage(1); }, 100);
+    }
+}, false);