- Electron version: 1.4.0
- Operating system: OS X 10.10.5

I've been using the following code to send Tab key events to a webview in my project:

``` js
const webContents = webView.getWebContents();
const keyEvent = {
  type: 'keyDown',
  keyCode: 'Tab'
};

webContents.sendInputEvent(keyEvent);
```

I have had no issues with this until the recent update to 1.4.0.

The last version the above code works in OS X is **1.3.7**. I've tried this with the latest versions of Electron (1.4.1 & 1.4.2) with the same results.

Am I doing something wrong here? Is this a known issue?

atom/common/native_mate_converters/blink_converter.cc
else if (type == "touchstart")
      *out = blink::WebInputEvent::TouchStart;
    else if (type == "touchmove")
      *out = blink::WebInputEvent::TouchMove;
    else if (type == "touchend")
      *out = blink::WebInputEvent::TouchEnd;
    else if (type == "touchcancel")
      *out = blink::WebInputEvent::TouchCancel;
    return true;
  }
};
template<>
struct Converter<blink::WebMouseEvent::Button> {
  static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
                     blink::WebMouseEvent::Button* out) {
    std::string button = base::ToLowerASCII(V8ToString(val));
    if (button == "left")
      *out = blink::WebMouseEvent::Button::ButtonLeft;
    else if (button == "middle")
      *out = blink::WebMouseEvent::Button::ButtonMiddle;
    else if (button == "right")
      *out = blink::WebMouseEvent::Button::ButtonRight;
    else
      return false;
    return true;
  }
};
template<>
struct Converter<blink::WebInputEvent::Modifiers> {
  static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,