Stop disabling force_compositing_mode for background RenderViews.

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..f623a0c0d74455040b20d87ab8ae359b1c267862 100644
--- a/extensions/browser/extension_host.cc
+++ b/extensions/browser/extension_host.cc
@@ -130,8 +130,10 @@ ExtensionHost::ExtensionHost(const Extension* extension,
          host_type == VIEW_TYPE_EXTENSION_DIALOG ||
          host_type == VIEW_TYPE_EXTENSION_INFOBAR ||
          host_type == VIEW_TYPE_EXTENSION_POPUP);
-  host_contents_.reset(WebContents::Create(
-      WebContents::CreateParams(browser_context_, site_instance))),
+  WebContents::CreateParams create_params(browser_context_, site_instance);
+  if (host_type == VIEW_TYPE_EXTENSION_BACKGROUND_PAGE)
+    create_params.initially_hidden = true;
+  host_contents_.reset(WebContents::Create(create_params));
   content::WebContentsObserver::Observe(host_contents_.get());
   host_contents_->SetDelegate(this);
   SetViewType(host_contents_.get(), host_type);
@@ -427,4 +429,10 @@ void ExtensionHost::RequestMediaAccessPermission(
       web_contents, request, callback, extension());
 }
 
+bool ExtensionHost::IsWebContentsNeverVisible(
+    content::WebContents* web_contents) {
+  ViewType view_type = extensions::GetViewType(web_contents);
+  return view_type == extensions::VIEW_TYPE_EXTENSION_BACKGROUND_PAGE;
+}
+
 }  // namespace extensions