Extension SW: Add tests that serve web_accessible_resources from a SW.

chrome/test/data/extensions/api_test/service_worker/web_accessible_resources/iframe_src/sw.js

Index: chrome/test/data/extensions/api_test/service_worker/web_accessible_resources/iframe_src/sw.js
diff --git a/chrome/test/data/extensions/api_test/service_worker/web_accessible_resources/iframe_src/sw.js b/chrome/test/data/extensions/api_test/service_worker/web_accessible_resources/iframe_src/sw.js
new file mode 100644
index 0000000000000000000000000000000000000000..b7a797bfca92a9315eaa96dfb9961ce10dbd2936
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/service_worker/web_accessible_resources/iframe_src/sw.js
@@ -0,0 +1,31 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var swIframeHTMLResponse =
+    '<script src="iframe_sw.js"></script>';
+
+var swIframeNonExistentHTMLResponse =
+    '<script src="iframe_non_existent.js"></script>';
+
+var swIframeJSResponse =
+    'window.onmessage = function(e) {' +
+    '  if (e.data == "ping") {' +
+    '    e.source.postMessage("FROM_SW_RESOURCE", "*")' +
+    '  }' +
+    '};';
+
+self.onfetch = function(e) {
+  if (/iframe.html$/.test(e.request.url)) {
+    e.respondWith(new Response(swIframeHTMLResponse, {
+      headers: {'Content-Type': 'text/html'}
+    }));
+  } else if (/iframe_non_existent.html$/.test(e.request.url)) {
+    e.respondWith(new Response(swIframeNonExistentHTMLResponse, {
+      headers: {'Content-Type': 'text/html'}
+    }));
+  } else if (/iframe_sw.js$/.test(e.request.url) ||
+             /iframe_non_existent.js$/.test(e.request.url)) {
+    e.respondWith(new Response(swIframeJSResponse));
+  }
+};