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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/ui/inspectable_web_contents.cc
extensions::chrome_manifest_urls::GetDevToolsPage(extension.get());
    if (devtools_page_url.is_empty())
      continue;
    
    
    
    content::ChildProcessSecurityPolicy::GetInstance()->GrantRequestOrigin(
        web_contents_->GetMainFrame()->GetProcess()->GetID(),
        url::Origin::Create(extension->url()));
    auto extension_info = std::make_unique<base::DictionaryValue>();
    extension_info->SetString("startPage", devtools_page_url.spec());
    extension_info->SetString("name", extension->name());
    extension_info->SetBoolean(
        "exposeExperimentalAPIs",
        extension->permissions_data()->HasAPIPermission(
            extensions::mojom::APIPermissionID::kExperimental));
    results.Append(std::move(extension_info));
  }
  CallClientFunction("DevToolsAPI.addExtensions", &results, NULL, NULL);
}
#endif
void InspectableWebContents::SetInspectedPageBounds(const gfx::Rect& rect) {
  DevToolsContentsResizingStrategy strategy(rect);
  if (contents_resizing_strategy_.Equals(strategy))
    return;
  contents_resizing_strategy_.CopyFrom(strategy);
  if (managed_devtools_web_contents_)
    view_->SetContentsResizingStrategy(contents_resizing_strategy_);
}
void InspectableWebContents::InspectElementCompleted() {}