- Electron version: 0.37.5
- Operating system: Mac OS X 10.11.4

When I pass `backgroundColor: '#FF0000' to a window, the color that shows up on the screen is actually '#FF301E'. 

atom/browser/api/atom_api_web_contents.cc
const content::WebContents* web_contents) {
  auto context = web_contents->GetBrowserContext();
  auto site_instance = web_contents->GetSiteInstance();
  if (!context || !site_instance)
    return nullptr;
  auto storage_partition =
      content::BrowserContext::GetStoragePartition(context, site_instance);
  if (!storage_partition)
    return nullptr;
  return storage_partition->GetServiceWorkerContext();
}
}  
WebContents::WebContents(content::WebContents* web_contents)
    : content::WebContentsObserver(web_contents),
      type_(REMOTE),
      request_id_(0),
      background_throttling_(true) {
  AttachAsUserData(web_contents);
  web_contents->SetUserAgentOverride(GetBrowserContext()->GetUserAgent());
}
WebContents::WebContents(v8::Isolate* isolate,
                         const mate::Dictionary& options)
    : embedder_(nullptr),
      request_id_(0),
      background_throttling_(true) {