Worker: Import "imported/wpt/workers" tests

third_party/WebKit/LayoutTests/imported/wpt/workers/interfaces/DedicatedWorkerGlobalScope/onmessage.worker.js

Index: third_party/WebKit/LayoutTests/imported/wpt/workers/interfaces/DedicatedWorkerGlobalScope/onmessage.worker.js
diff --git a/third_party/WebKit/LayoutTests/imported/wpt/workers/interfaces/DedicatedWorkerGlobalScope/onmessage.worker.js b/third_party/WebKit/LayoutTests/imported/wpt/workers/interfaces/DedicatedWorkerGlobalScope/onmessage.worker.js
new file mode 100644
index 0000000000000000000000000000000000000000..6f285caac38574ca95cd634e014ca444f246bf73
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/imported/wpt/workers/interfaces/DedicatedWorkerGlobalScope/onmessage.worker.js
@@ -0,0 +1,40 @@
+importScripts("/resources/testharness.js");
+
+test(function() {
+  self.onmessage = 1;
+  assert_equals(self.onmessage, null,
+                "attribute should return null after being set to a primitive");
+}, "Setting onmessage to 1");
+
+test(function() {
+  var object = {
+    handleEvent: this.unreached_func()
+  };
+  self.onmessage = object;
+  assert_equals(self.onmessage, object,
+                "attribute should return the object it was set to.");
+
+  self.dispatchEvent(new Event("message"));
+}, "Setting onmessage to an object");
+
+test(function() {
+  var triggered = false;
+  var f = function(e) { triggered = true; };
+  self.onmessage = f;
+  assert_equals(self.onmessage, f,
+                "attribute should return the function it was set to.");
+
+  self.dispatchEvent(new Event("message"));
+  assert_true(triggered, "event handler should have been triggered");
+}, "Setting onmessage to a function");
+
+
+test(function() {
+  assert_not_equals(self.onmessage, null,
+                    "attribute should not return null after being set to a function");
+  self.onmessage = 1;
+  assert_equals(self.onmessage, null,
+                "attribute should return null after being set to a primitive");
+}, "Setting onmessage to 1 (again)");
+
+done();