<!--  As an open source project with a dedicated but small maintainer team, it can sometimes take a long time for issues to be addressed so please be patient and we will get back to you as soon as we can.
-->

### Preflight Checklist
<!-- Please ensure you've completed the following steps by replacing [ ] with [x]-->

* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for an issue that matches the one I want to file, without success.


### 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/ui/inspectable_web_contents.cc
devtools_bounds_.set_y(
          display.y() + (display.height() - devtools_bounds_.height()) / 2);
    }
  }
  g_web_contents_instances_.push_back(this);
}
InspectableWebContents::~InspectableWebContents() {
  g_web_contents_instances_.remove(this);
  
  if (GetDevToolsWebContents())
    WebContentsDestroyed();
  
}
InspectableWebContentsView* InspectableWebContents::GetView() const {
  return view_.get();
}
content::WebContents* InspectableWebContents::GetWebContents() const {
  return web_contents_.get();
}
content::WebContents* InspectableWebContents::GetDevToolsWebContents() const {
  if (external_devtools_web_contents_)
    return external_devtools_web_contents_;
  else
    return managed_devtools_web_contents_.get();
}
void InspectableWebContents::InspectElement(int x, int y) {
  if (agent_host_)
    agent_host_->InspectElement(web_contents_->GetMainFrame(), x, y);
}
void InspectableWebContents::SetDelegate(