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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.h
void GoToOffset(int offset);
  bool CanGoToIndex(int index) const;
  void GoToIndex(int index);
  int GetActiveIndex() const;
  void ClearHistory();
  int GetHistoryLength() const;
  const std::string GetWebRTCIPHandlingPolicy() const;
  void SetWebRTCIPHandlingPolicy(const std::string& webrtc_ip_handling_policy);
  bool IsCrashed() const;
  void ForcefullyCrashRenderer();
  void SetUserAgent(const std::string& user_agent);
  std::string GetUserAgent();
  void InsertCSS(const std::string& css);
  v8::Local<v8::Promise> SavePage(const base::FilePath& full_file_path,
                                  const content::SavePageType& save_type);
  void OpenDevTools(gin::Arguments* args);
  void CloseDevTools();
  bool IsDevToolsOpened();
  bool IsDevToolsFocused();
  void ToggleDevTools();
  void EnableDeviceEmulation(const blink::DeviceEmulationParams& params);
  void DisableDeviceEmulation();
  void InspectElement(int x, int y);
  void InspectSharedWorker();
  void InspectSharedWorkerById(const std::string& workerId);
  std::vector<scoped_refptr<content::DevToolsAgentHost>> GetAllSharedWorkers();
  void InspectServiceWorker();
  void SetIgnoreMenuShortcuts(bool ignore);
  void SetAudioMuted(bool muted);
  bool IsAudioMuted();