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### Issue Details
Electron Version: All Version
Operating System: macOS 10.15.3
Last Known Working Electron version: Never

### Bug
The color picker in devtools does not work.
In devtools if you want to change the colors of the CSS code. When you click on a color a color picker is supposed to appear but it does not appear.

### Screenshots
<img width="1013" alt="Capture d’écran 2020-09-07 à 11 42 44" src="https://user-images.githubusercontent.com/70572698/92374841-988ea280-f100-11ea-96be-afc93f6dd645.png">

shell/browser/api/electron_api_web_contents.cc
content::RenderFrameHost* render_frame_host) {
  auto* rwhv = render_frame_host->GetView();
  if (!rwhv)
    return;
  
  auto* web_preferences = WebContentsPreferences::From(ontents());
  if (web_preferences) {
    std::string color_name;
    if (web_preferences->GetPreference(options::kBackgroundColor,
                                       &color_name)) {
      rwhv->SetBackgroundColor(ParseHexColor(color_name));
    } else {
      rwhv->SetBackgroundColor(SK_ColorTRANSPARENT);
    }
  }
  if (!background_throttling_)
    render_frame_host->GetRenderViewHost()->SetSchedulerThrottling(false);
  auto* rwh_impl =
      static_cast<content::RenderWidgetHostImpl*>(rwhv->GetRenderWidgetHost());
  if (rwh_impl)
    rwh_impl->disable_hidden_ = !background_throttling_;
  WebFrameMain::RenderFrameCreated(render_frame_host);
}
void WebContents::RenderFrameCreated(
    content::RenderFrameHost* render_frame_host) {
  HandleNewRenderFrame(render_frame_host);
}
void WebContents::RenderViewDeleted(content::RenderViewHost* render_view_host) {