Stop disabling force_compositing_mode for background RenderViews.

content/browser/renderer_host/render_view_host_delegate.cc

 // Copyright (c) 2012 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 "content/browser/renderer_host/render_view_host_delegate.h"
 
 #include "url/gurl.h"
 #include "webkit/common/webpreferences.h"
 
 namespace content {
@@ skipping 21 matching lines @@
 
 SessionStorageNamespace* RenderViewHostDelegate::GetSessionStorageNamespace(
     SiteInstance* instance) {
   return NULL;
 }
 
 FrameTree* RenderViewHostDelegate::GetFrameTree() {
   return NULL;
 }
 
+bool RenderViewHostDelegate::IsNeverVisible() {
+  return false;
+}
+
 }  // namespace content