Add two interfaces for ServiceWorkerProviderContext/ProviderHost

content/common/service_worker/service_worker_provider_interfaces.mojom

+// Copyright 2017 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;
+
+// Browser-side interface bound to ServiceWorkerProviderHost.

[falken, 2017/03/28 06:29:43]

This might read better as "mojom::ServiceWorkerProviderHost is a browser-side
interface bound to content::ServiceWorkerProviderHost", since they are both
called SWProviderHost

Also may be easier to understand if it additionally says something like "The
renderer uses this interface to request the browser to do operations involving
service worker registrations."

[shimazu, 2017/05/08 08:34:29]

Done.

+// ServiceWorkerProviderHost bouhd with this interface will be destroyed when

[falken, 2017/03/28 06:29:43]

"A content::ServiceWorkerProviderHost bound with this interface..."

[shimazu, 2017/05/08 08:34:29]

Done.

+// the connection is disconnected.
+interface ServiceWorkerProviderHost {
+  // TODO(shimazu): implement them.
+  // register() => ();
+  // getRegistation() => ();
+  // getRegistrations() => ();
+  // getRegistrationForReady() => ();
+};
+
+// Renderer-side interface bound to ServiceWorkerProviderContext.

[falken, 2017/03/28 06:29:43]

similar as above

[shimazu, 2017/05/08 08:34:29]

Done.

+interface ServiceWorkerProvider {
+  // TODO(shimazu): implement them.
+  // associateRegistration();
+  // disassociateRegistration();
+  // setControllerServiceWorker();
+  // messageToDocument();
+};