ServiceWorker: Implement StartWorker by using mojo

content/common/service_worker/embedded_worker.mojom

Index: content/common/service_worker/embedded_worker.mojom
diff --git a/content/common/service_worker/embedded_worker.mojom b/content/common/service_worker/embedded_worker.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..d15d62bb2371ebae30cf4f56ea2122759ffa5308
--- /dev/null
+++ b/content/common/service_worker/embedded_worker.mojom
@@ -0,0 +1,16 @@
+// Copyright 2016 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.
+
+module content.mojom;
+
+import "services/shell/public/interfaces/interface_provider.mojom";
+import "url/mojo/url.mojom";
+
+[Native]
+struct EmbeddedWorkerStartParams;
+
+// Interface to control a renderer-side worker's environment.
+interface EmbeddedWorkerInstanceClient {
+  StartWorker(EmbeddedWorkerStartParams params);
+};