[ServiceWorker] Add EmbeddedWorkerInstanceHost Interface.

content/renderer/service_worker/embedded_worker_dispatcher.cc

 // Copyright 2013 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.
 
 #include "content/renderer/service_worker/embedded_worker_dispatcher.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
@@ skipping 35 matching lines @@
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(EmbeddedWorkerDispatcher, message)
     IPC_MESSAGE_HANDLER(EmbeddedWorkerMsg_StopWorker, OnStopWorker)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void EmbeddedWorkerDispatcher::WorkerContextDestroyed(
     int embedded_worker_id) {
-  RenderThreadImpl::current()->thread_safe_sender()->Send(
-      new EmbeddedWorkerHostMsg_WorkerStopped(embedded_worker_id));

[leonhsl(Using Gerrit), 2017/04/04 07:14:04]

All callsites of EmbeddedWorkerDispatcher::WorkerContextDestroyed() are in
ServiceWorkerContextClient, send EmbeddedWorkerHostMsg_WorkerStopped there
instead.

   UnregisterWorker(embedded_worker_id);
 }
 
 void EmbeddedWorkerDispatcher::OnStopWorker(int embedded_worker_id) {
   TRACE_EVENT0("ServiceWorker", "EmbeddedWorkerDispatcher::OnStopWorker");
   WorkerWrapper* wrapper = workers_.Lookup(embedded_worker_id);
   // OnStopWorker is possible to be called twice.
   if (!wrapper) {
     LOG(WARNING) << "Got OnStopWorker for nonexistent worker";
     return;
@@ skipping 52 matching lines @@
 void EmbeddedWorkerDispatcher::RecordStopWorkerTimer(int embedded_worker_id) {
   WorkerWrapper* wrapper = workers_.Lookup(embedded_worker_id);
   DCHECK(wrapper);
   // This should eventually call WorkerContextDestroyed. (We may need to post
   // a delayed task to forcibly abort the worker context if we find it
   // necessary)
   stop_worker_times_[embedded_worker_id] = base::TimeTicks::Now();
 }
 
 }  // namespace content