Register a Service Worker when an extension is enabled.

extensions/browser/extension_host.cc

Index: extensions/browser/extension_host.cc
diff --git a/extensions/browser/extension_host.cc b/extensions/browser/extension_host.cc
index 0eac1fbbf30b12e227cdc6c143db6f2423bec3a5..13c7758049e662a1f32f25207d4e1edd61cc0505 100644
--- a/extensions/browser/extension_host.cc
+++ b/extensions/browser/extension_host.cc
@@ -173,17 +173,29 @@ bool ExtensionHost::IsRenderViewLive() const {
   return render_view_host()->IsRenderViewLive();
 }
 
-void ExtensionHost::CreateRenderViewSoon() {
+void ExtensionHost::CreateRenderViewSoon(const base::Closure& continuation) {
   if ((render_process_host() && render_process_host()->HasConnection())) {
     // If the process is already started, go ahead and initialize the RenderView
     // synchronously. The process creation is the real meaty part that we want
     // to defer.
     CreateRenderViewNow();
+    if (!continuation.is_null())
+      continuation.Run();
   } else {
+    if (!continuation.is_null())
+      when_render_view_created_.push_back(continuation);
     ProcessCreationQueue::GetInstance()->CreateSoon(this);
   }
 }
 
+static void RunAll(const std::vector<base::Closure>& callbacks) {
+  for (std::vector<base::Closure>::const_iterator it = callbacks.begin();
+       it != callbacks.end();
+       ++it) {
+    it->Run();
+  }
+}
+
 void ExtensionHost::CreateRenderViewNow() {
   LoadInitialURL();
   if (IsBackgroundPage()) {
@@ -191,6 +203,12 @@ void ExtensionHost::CreateRenderViewNow() {
     // Connect orphaned dev-tools instances.
     delegate_->OnRenderViewCreatedForBackgroundPage(this);
   }
+  std::vector<base::Closure> running;
+  running.swap(when_render_view_created_);
+  base::MessageLoop::current()->PostDelayedTask(
+      FROM_HERE,
+      base::Bind(&RunAll, running),
+      base::TimeDelta::FromMilliseconds(10));
 }
 
 const GURL& ExtensionHost::GetURL() const {