Stop disabling force_compositing_mode for background RenderViews.

extensions/browser/extension_host.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/browser/extension_host.h"
 
 #include <list>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 112 matching lines @@
       did_stop_loading_(false),
       document_element_available_(false),
       initial_url_(url),
       extension_function_dispatcher_(browser_context_, this),
       extension_host_type_(host_type) {
   // Not used for panels, see PanelHost.
   DCHECK(host_type == VIEW_TYPE_EXTENSION_BACKGROUND_PAGE ||
          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);
 
   render_view_host_ = host_contents_->GetRenderViewHost();
 
   // Listen for when an extension is unloaded from the same profile, as it may
   // be the same extension that this points to.
   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED_DEPRECATED,
                  content::Source<BrowserContext>(browser_context_));
@@ skipping 275 matching lines @@
 }
 
 void ExtensionHost::RequestMediaAccessPermission(
     content::WebContents* web_contents,
     const content::MediaStreamRequest& request,
     const content::MediaResponseCallback& callback) {
   delegate_->ProcessMediaAccessRequest(
       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