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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
auto* const host = ontents()->GetMainFrame();
  if (host)
    host->CopyImageAt(x, y);
}
void WebContents::Focus() {
   Focusing on WebContents does not automatically focus the window on macOS
   and Linux, do it manually to match the behavior on Windows.
#if defined(OS_MAC) || defined(OS_LINUX)
  if (owner_window())
    owner_window()->Focus(true);
#endif
  ontents()->Focus();
}
#if !defined(OS_MAC)
bool WebContents::IsFocused() const {
  auto* view = ontents()->GetRenderWidgetHostView();
  if (!view)
    return false;
  if (GetType() != Type::kBackgroundPage) {
    auto* window = ontents()->GetNativeView()->GetToplevelWindow();
    if (window && !window->IsVisible())
      return false;
  }
  return view->HasFocus();
}
#endif
void WebContents::SendInputEvent(v8::Isolate* isolate,