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### Preflight Checklist
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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
}
 static
v8::LobjectTemplate> WebContents::FillObjectTemplate(
    v8::Isolate* isolate,
    v8::LobjectTemplate> templ) {
  gin::InvokerOptions options;
  options.holder_is_first_argument = true;
  options.holder_type = "WebContents";
  templ->Set(
      gin::StringToSymbol(isolate, "isDestroyed"),
      gin::CreateFunctionTemplate(
          isolate, base::BindRepeating(&gin_helper::Destroyable::IsDestroyed),
          options));
   We use gin_helper::ObjectTemplateBuilder instead of
   gin::ObjectTemplateBuilder here to handle the fact that WebContents is
   destroyable.
  lper::ObjectTemplateBuilder(isolate, templ)
      .SetMethod("destroy", &WebContents::Destroy)
      .SetMethod("getBackgroundThrottling",
                 &WebContents::GetBackgroundThrottling)
      .SetMethod("setBackgroundThrottling",
                 &WebContents::SetBackgroundThrottling)
      .SetMethod("getProcessId", &WebContents::GetProcessID)
      .SetMethod("getOSProcessId", &WebContents::GetOSProcessID)
      .SetMethod("equal", &WebContents::Equal)
      .SetMethod("_loadURL", &WebContents::LoadURL)
      .SetMethod("reload", &WebContents::Reload)
      .SetMethod("reloadIgnoringCache", &WebContents::ReloadIgnoringCache)
      .SetMethod("downloadURL", &WebContents::DownloadURL)
      .SetMethod("getURL", &WebContents::GetURL)