WIP attempt to replace StartWorker/StopWorker IPCs with a new mojo EmbeddedWorker service.

content/renderer/service_worker/service_worker_context_client.cc

Index: content/renderer/service_worker/service_worker_context_client.cc
diff --git a/content/renderer/service_worker/service_worker_context_client.cc b/content/renderer/service_worker/service_worker_context_client.cc
index 2efc2fa6dfecf33e8565dfc1418b37d98699ceb8..05dd0fb88c82800040aac9b759f957a6c8acd908 100644
--- a/content/renderer/service_worker/service_worker_context_client.cc
+++ b/content/renderer/service_worker/service_worker_context_client.cc
@@ -32,7 +32,7 @@
 #include "content/public/renderer/document_state.h"
 #include "content/renderer/devtools/devtools_agent.h"
 #include "content/renderer/render_thread_impl.h"
-#include "content/renderer/service_worker/embedded_worker_dispatcher.h"
+#include "content/renderer/service_worker/embedded_worker_impl.h"
 #include "content/renderer/service_worker/service_worker_type_util.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_message_macros.h"
@@ -57,14 +57,6 @@ namespace {
 base::LazyInstance<base::ThreadLocalPointer<ServiceWorkerContextClient>>::
     Leaky g_worker_client_tls = LAZY_INSTANCE_INITIALIZER;
 
-void CallWorkerContextDestroyedOnMainThread(int embedded_worker_id) {
-  if (!RenderThreadImpl::current() ||
-      !RenderThreadImpl::current()->embedded_worker_dispatcher())
-    return;
-  RenderThreadImpl::current()->embedded_worker_dispatcher()->
-      WorkerContextDestroyed(embedded_worker_id);
-}
-
 // We store an instance of this class in the "extra data" of the WebDataSource
 // and attach a ServiceWorkerNetworkProvider to it as base::UserData.
 // (see createServiceWorkerNetworkProvider).
@@ -209,11 +201,13 @@ ServiceWorkerContextClient::ThreadSpecificInstance() {
 
 ServiceWorkerContextClient::ServiceWorkerContextClient(
     int embedded_worker_id,
+    EmbeddedWorkerImpl* embedded_worker,
     int64 service_worker_version_id,
     const GURL& service_worker_scope,
     const GURL& script_url,
     int worker_devtools_agent_route_id)
     : embedded_worker_id_(embedded_worker_id),
+      embedded_worker_(embedded_worker),
       service_worker_version_id_(service_worker_version_id),
       service_worker_scope_(service_worker_scope),
       script_url_(script_url),
@@ -225,10 +219,8 @@ ServiceWorkerContextClient::ServiceWorkerContextClient(
                            "ServiceWorkerContextClient::StartingWorkerContext",
                            this);
   TRACE_EVENT_ASYNC_STEP_INTO0(
-      "ServiceWorker",
-      "ServiceWorkerContextClient::StartingWorkerContext",
-      this,
-      "PrepareWorker");
+      "ServiceWorker", "ServiceWorkerContextClient::StartingWorkerContext",
+      this, "PrepareWorker");
 }
 
 ServiceWorkerContextClient::~ServiceWorkerContextClient() {}
@@ -324,9 +316,7 @@ void ServiceWorkerContextClient::workerContextFailedToStart() {
   DCHECK(!proxy_);
 
   Send(new EmbeddedWorkerHostMsg_WorkerScriptLoadFailed(embedded_worker_id_));
-
-  RenderThreadImpl::current()->embedded_worker_dispatcher()->
-      WorkerContextDestroyed(embedded_worker_id_);
+  embedded_worker_->WorkerContextDestroyed();
 }
 
 void ServiceWorkerContextClient::workerContextStarted(
@@ -389,13 +379,7 @@ void ServiceWorkerContextClient::willDestroyWorkerContext() {
 
 void ServiceWorkerContextClient::workerContextDestroyed() {
   DCHECK(g_worker_client_tls.Pointer()->Get() == NULL);
-
-  // Now we should be able to free the WebEmbeddedWorker container on the
-  // main thread.
-  main_thread_task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(&CallWorkerContextDestroyedOnMainThread,
-                 embedded_worker_id_));
+  embedded_worker_->WorkerContextDestroyed();
 }
 
 void ServiceWorkerContextClient::reportException(