* Electron version: 1.8.2
* Operating system: macos 10.13.3

Reproducing repo: https://github.com/ibash/electron-webkit-app-drag

Demonstrates a bug where `-webkit-app-region: drag` causes a browser view in front of it to miss click events. Oddly - it does not prevent hover events.

Steps:
1. Clone https://github.com/ibash/electron-webkit-app-drag, `yarn install`, `yarn start`
2. Click "button1"
3. Click "button2"

Expected:

Clicking button1 or button2 pops up an alert: "button clicked!"

Actual:

Only clicking button2 pops up an alert: "button clicked!"

atom/browser/api/atom_api_browser_window.cc
Emit("scroll-touch-end");
}
void BrowserWindow::OnWindowSwipe(const std::string& direction) {
  Emit("swipe", direction);
}
void BrowserWindow::OnWindowSheetBegin() {
  Emit("sheet-begin");
}
void BrowserWindow::OnWindowSheetEnd() {
  Emit("sheet-end");
}
void BrowserWindow::OnWindowEnterHtmlFullScreen() {
  Emit("enter-html-full-screen");
}
void BrowserWindow::OnWindowLeaveHtmlFullScreen() {
  Emit("leave-html-full-screen");
}
void BrowserWindow::OnExecuteWindowsCommand(const std::string& command_name) {
  Emit("app-command", command_name);
}
void BrowserWindow::OnTouchBarItemResult(const std::string& item_id,
                                  const base::DictionaryValue& details) {
  Emit("-touch-bar-interaction", item_id, details);
}
void BrowserWindow::OnNewWindowForTab() {
  Emit("new-window-for-tab");
}
#if defined(OS_WIN)
void BrowserWindow::OnWindowMessage(UINT message,