[ServiceWorker] CSP support for ServiceWorker environment.

LayoutTests/http/tests/serviceworker/resources/service-worker-csp-worker.php

+<?php 
+header('Content-Type: application/javascript');
+$directive = $_GET['directive'];
+
+if ($directive == 'default') {
+  header('Content-Security-Policy: default-src \'self\'');
+
+?>
+importScripts('worker-testharness.js');
+importScripts('test-helpers.js');
+
+test(function() {
+    var import_script_failed = false;
+    try {
+      importScripts('http://localhost:8000/serviceworker/resources/empty.js');
+    } catch(e) {
+      import_script_failed = true;
+    }
+    assert_true(import_script_failed,
+                'Importing the other origins script should fail.');
+  }, 'importScripts test for default-src');
+
+async_test(function(t) {
+    fetch('http://localhost:8000/serviceworker/resources/fetch-access-control.php?ACAOrigin=*',
+          {mode: 'cors'})
+      .then(function(response){
+          assert_unreached('fetch should fail.');
+        }, function(){
+          t.done();
+        })
+      .catch(unreached_rejection(t));
+  }, 'Fetch test for default-src');
+
+<?php
+
+} else if ($directive == 'script') {
+  header('Content-Security-Policy: script-src \'self\'');
+
+?>
+importScripts('worker-testharness.js');
+importScripts('test-helpers.js');
+
+test(function() {
+    var import_script_failed = false;
+    try {
+      importScripts('http://localhost:8000/serviceworker/resources/empty.js');
+    } catch(e) {
+      import_script_failed = true;
+    }
+    assert_true(import_script_failed,
+                'Importing the other origins script should fail.');
+  }, 'importScripts test for script-src');
+
+async_test(function(t) {
+    fetch('http://localhost:8000/serviceworker/resources/fetch-access-control.php?ACAOrigin=*',
+          {mode: 'cors'})
+      .then(function(response){
+          t.done();
+        }, function(){
+          assert_unreached('fetch should not fail.');
+        })
+      .catch(unreached_rejection(t));
+  }, 'Fetch test for script-src');
+
+<?php
+
+} else if ($directive == 'connect') {
+  header('Content-Security-Policy: connect-src \'self\'');
+
+?>
+importScripts('worker-testharness.js');
+importScripts('test-helpers.js');
+
+test(function() {
+    var import_script_failed = false;
+    try {
+      importScripts('http://localhost:8000/serviceworker/resources/empty.js');
+    } catch(e) {
+      import_script_failed = true;
+    }
+    assert_false(import_script_failed,
+                 'Importing the other origins script should not fail.');
+  }, 'importScripts test for connect-src');
+
+async_test(function(t) {
+    fetch('http://localhost:8000/serviceworker/resources/fetch-access-control.php?ACAOrigin=*',
+          {mode: 'cors'})
+      .then(function(response){
+          assert_unreached('fetch should fail.');
+        }, function(){
+          t.done();
+        })
+      .catch(unreached_rejection(t));
+  }, 'Fetch test for connect-src');
+
+<?php
+}
+?>