- Electron version: 1.2.2
- Operating system: Linux

This is a problem only in linux. It works in OSX.

``` javascript
win.hide()
win.capturePage(function(img){
 // never called
})
```

shell/browser/api/electron_api_web_contents.cc
Emit("paint", dirty_rect, gfx::Image::CreateFrom1xBitmap(bitmap));
}
void WebContents::StartPainting() {
  auto* osr_wcv = GetOffScreenWebContentsView();
  if (osr_wcv)
    osr_wcv->SetPainting(true);
}
void WebContents::StopPainting() {
  auto* osr_wcv = GetOffScreenWebContentsView();
  if (osr_wcv)
    osr_wcv->SetPainting(false);
}
bool WebContents::IsPainting() const {
  auto* osr_wcv = GetOffScreenWebContentsView();
  return osr_wcv && osr_wcv->IsPainting();
}
void WebContents::SetFrameRate(int frame_rate) {
  auto* osr_wcv = GetOffScreenWebContentsView();
  if (osr_wcv)
    osr_wcv->SetFrameRate(frame_rate);
}
int WebContents::GetFrameRate() const {
  auto* osr_wcv = GetOffScreenWebContentsView();
  return osr_wcv ? osr_wcv->GetFrameRate() : 0;
}
#endif
void WebContents::Invalidate() {