This defers starting background extension page RenderViews

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 d7cd52829ab2171c9ea3e3db3d92d946e0fbc095..61429630b4697796bc59350aec575c8e046b3f07 100644
--- a/chrome/browser/extensions/extension_host.cc
+++ b/chrome/browser/extensions/extension_host.cc
@@ -84,11 +84,23 @@ class ExtensionHost::ProcessCreationQueue {
     PostTask();
   }
 
+  void DeferCreation(ExtensionHost* host) {
+    deferred_queue_.push_back(host);
+  }
+
+  void CreateDeferredRenderViews() {
+    queue_.splice(queue_.end(), deferred_queue_);
+    PostTask();
+  }
+
   // Remove a host from the queue (in case it's being deleted).
   void Remove(ExtensionHost* host) {
     Queue::iterator it = std::find(queue_.begin(), queue_.end(), host);
     if (it != queue_.end())
       queue_.erase(it);
+    it = std::find(deferred_queue_.begin(), deferred_queue_.end(), host);
+    if (it != deferred_queue_.end())
+      deferred_queue_.erase(it);
   }
 
  private:
@@ -123,6 +135,7 @@ class ExtensionHost::ProcessCreationQueue {
 
   typedef std::list<ExtensionHost*> Queue;
   Queue queue_;
+  Queue deferred_queue_;
   bool pending_create_;
   base::WeakPtrFactory<ProcessCreationQueue> ptr_factory_;
 };
@@ -231,13 +244,29 @@ void ExtensionHost::CreateRenderViewSoon() {
   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 rate limit.
+    CreateRenderViewNow();
+  } else {
+      ProcessCreationQueue::GetInstance()->CreateSoon(this);
+  }
+}
+
+void ExtensionHost::CreateRenderViewDeferred() {
+  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();
   } else {
-    ProcessCreationQueue::GetInstance()->CreateSoon(this);
+      ProcessCreationQueue::GetInstance()->DeferCreation(this);
   }
 }
 
+// static
+void ExtensionHost::CreateDeferredRenderViews() {
+  ProcessCreationQueue::GetInstance()->CreateDeferredRenderViews();
+}
+
 void ExtensionHost::CreateRenderViewNow() {
   LoadInitialURL();
   if (is_background_page()) {