Register a Service Worker when an extension is enabled.

chrome/browser/extensions/extension_host.cc

Index: chrome/browser/extensions/extension_host.cc
diff --git a/chrome/browser/extensions/extension_host.cc b/chrome/browser/extensions/extension_host.cc
index 8c66891594bfe219c32a8171b5245506a43645a8..4bccedf2cc2f2026c7f836daf808e23e5a54e9f3 100644
--- a/chrome/browser/extensions/extension_host.cc
+++ b/chrome/browser/extensions/extension_host.cc
@@ -180,13 +180,17 @@ 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);
   }
 }
@@ -198,6 +202,13 @@ void ExtensionHost::CreateRenderViewNow() {
     // Connect orphaned dev-tools instances.
     delegate_->OnRenderViewCreatedForBackgroundPage(this);
   }
+  std::vector<base::Closure> running;
+  running.swap(when_render_view_created_);
+  for (std::vector<base::Closure>::const_iterator it = running.begin();
+       it != running.end();
+       ++it) {
+    it->Run();
+  }
 }
 
 const GURL& ExtensionHost::GetURL() const {