Teach EmbeddedWorkerInstance to create a process when it needs one.

content/browser/service_worker/service_worker_dispatcher_host.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/browser/service_worker/service_worker_dispatcher_host.h"
 
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/message_port_message_filter.h"
 #include "content/browser/message_port_service.h"
@@ skipping 26 matching lines @@
 };
 
 }  // namespace
 
 ServiceWorkerDispatcherHost::ServiceWorkerDispatcherHost(
     int render_process_id,
     MessagePortMessageFilter* message_port_message_filter)
     : BrowserMessageFilter(kFilteredMessageClasses,
                            arraysize(kFilteredMessageClasses)),
       render_process_id_(render_process_id),
-      message_port_message_filter_(message_port_message_filter) {}
+      message_port_message_filter_(message_port_message_filter),
+      channel_ready_(false) {
+}
 
 ServiceWorkerDispatcherHost::~ServiceWorkerDispatcherHost() {
   if (context_) {
     context_->RemoveAllProviderHostsForProcess(render_process_id_);
     context_->embedded_worker_registry()->RemoveChildProcessSender(
         render_process_id_);
   }
 }
 
 void ServiceWorkerDispatcherHost::Init(
     ServiceWorkerContextWrapper* context_wrapper) {
   if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(&ServiceWorkerDispatcherHost::Init,
                     this, make_scoped_refptr(context_wrapper)));
       return;
   }
   context_ = context_wrapper->context()->AsWeakPtr();
   context_->embedded_worker_registry()->AddChildProcessSender(
       render_process_id_, this);
 }
 
+void ServiceWorkerDispatcherHost::OnFilterAdded(IPC::Channel* channel) {
+  BrowserMessageFilter::OnFilterAdded(channel);
+  channel_ready_ = true;
+  std::vector<IPC::Message*> messages;
+  pending_messages_.release(&messages);
+  for (size_t i = 0; i < messages.size(); ++i) {
+    BrowserMessageFilter::Send(messages[i]);
+  }
+}
+
 void ServiceWorkerDispatcherHost::OnDestruct() const {
   BrowserThread::DeleteOnIOThread::Destruct(this);
 }
 
 bool ServiceWorkerDispatcherHost::OnMessageReceived(
     const IPC::Message& message,
     bool* message_was_ok) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP_EX(
     ServiceWorkerDispatcherHost, message, *message_was_ok)
@@ skipping 28 matching lines @@
 
   if (!handled && context_) {
     handled = context_->embedded_worker_registry()->OnMessageReceived(message);
     if (!handled)
       BadMessageReceived();
   }
 
   return handled;
 }
 
+bool ServiceWorkerDispatcherHost::Send(IPC::Message* message) {
+  if (channel_ready_) {
+    BrowserMessageFilter::Send(message);
+    // Don't bother passing through Send()'s result: it's not reliable.
+    return true;
+  }
+
+  pending_messages_.push_back(message);
+  return true;
+}
+
 void ServiceWorkerDispatcherHost::RegisterServiceWorkerHandle(
     scoped_ptr<ServiceWorkerHandle> handle) {
   int handle_id = handle->handle_id();
   handles_.AddWithID(handle.release(), handle_id);
 }
 
 void ServiceWorkerDispatcherHost::OnRegisterServiceWorker(
     int thread_id,
     int request_id,
     int provider_id,
@@ skipping 247 matching lines @@
     ServiceWorkerStatusCode status) {
   base::string16 error_message;
   blink::WebServiceWorkerError::ErrorType error_type;
   GetServiceWorkerRegistrationStatusResponse(
       status, &error_type, &error_message);
   Send(new ServiceWorkerMsg_ServiceWorkerRegistrationError(
       thread_id, request_id, error_type, error_message));
 }
 
 }  // namespace content