This defers starting background extension page RenderViews

chrome/browser/extensions/extension_process_manager.cc

Index: chrome/browser/extensions/extension_process_manager.cc
diff --git a/chrome/browser/extensions/extension_process_manager.cc b/chrome/browser/extensions/extension_process_manager.cc
index ae861fa34d8edd40929db103c9f28a5fa0849211..70a57a33ae6706809681480cf35a94873bcfa9d6 100644
--- a/chrome/browser/extensions/extension_process_manager.cc
+++ b/chrome/browser/extensions/extension_process_manager.cc
@@ -304,7 +304,10 @@ void ExtensionProcessManager::CreateBackgroundHost(
                         extensions::VIEW_TYPE_EXTENSION_BACKGROUND_PAGE);
 #endif
 
-  host->CreateRenderViewSoon();
+  if (defer_background_host_creation_)

[Matt Perry, 2013/08/31 00:22:23]

Since you're doing this for all background hosts, I think it'd be better to use
ExtensionProcessManager::DeferLoadingBackgroundHosts. Add some logic to call
CreateBackgroundHostsForProfileStartup when that switches from true to false.
Then you don't need to change ExtensionHost at all.

[Greg Spencer (Chromium), 2013/09/03 19:09:31]

Good point, that does simplify things. Done.

+    host->CreateRenderViewDeferred();
+  else
+    host->CreateRenderViewSoon();
   OnExtensionHostCreated(host, true);
 }
 
@@ -544,6 +547,14 @@ void ExtensionProcessManager::CancelSuspend(const Extension* extension) {
   }
 }
 
+void ExtensionProcessManager::DeferBackgroundHostCreation(bool defer) {
+  defer_background_host_creation_ = defer;
+}
+
+void ExtensionProcessManager::CreateDeferredBackgroundHosts() {
+  ExtensionHost::CreateDeferredRenderViews();
+}
+
 void ExtensionProcessManager::Observe(
     int type,
     const content::NotificationSource& source,