* 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
.SetMethod("mergeAllWindows", &BrowserWindow::MergeAllWindows)
      .SetMethod("selectPreviousTab", &BrowserWindow::SelectPreviousTab)
      .SetMethod("selectNextTab", &BrowserWindow::SelectNextTab)
      .SetMethod("moveTabToNewWindow", &BrowserWindow::MoveTabToNewWindow)
      .SetMethod("toggleTabBar", &BrowserWindow::ToggleTabBar)
      .SetMethod("addTabbedWindow", &BrowserWindow::AddTabbedWindow)
#endif
      .SetMethod("setVibrancy", &BrowserWindow::SetVibrancy)
      .SetMethod("_setTouchBarItems", &BrowserWindow::SetTouchBar)
      .SetMethod("_refreshTouchBarItem", &BrowserWindow::RefreshTouchBarItem)
      .SetMethod("_setEscapeTouchBarItem",
                 &BrowserWindow::SetEscapeTouchBarItem)
#if defined(OS_WIN)
      .SetMethod("hookWindowMessage", &BrowserWindow::HookWindowMessage)
      .SetMethod("isWindowMessageHooked",
                 &BrowserWindow::IsWindowMessageHooked)
      .SetMethod("unhookWindowMessage", &BrowserWindow::UnhookWindowMessage)
      .SetMethod("unhookAllWindowMessages",
                 &BrowserWindow::UnhookAllWindowMessages)
      .SetMethod("setThumbnailClip", &BrowserWindow::SetThumbnailClip)
      .SetMethod("setThumbnailToolTip", &BrowserWindow::SetThumbnailToolTip)
      .SetMethod("setAppDetails", &BrowserWindow::SetAppDetails)
#endif
#if defined(TOOLKIT_VIEWS)
      .SetMethod("setIcon", &BrowserWindow::SetIcon)
#endif
      .SetProperty("id", &BrowserWindow::ID)
      .SetProperty("webContents", &BrowserWindow::WebContents);
}
v8::Local<v8::Value> BrowserWindow::From(v8::Isolate* isolate,