obvious, WindowCapturerWin should not return Result::SUCCESS with an empty
frame.
This issue was original introduced into the code base in change
https://codereview.webrtc.org/1988783003/.
I am also considering whether we should move the
previous_size_ = frame->size();
window_size_map_[window_] = previous_size_;
into the true branch. But since this change needs to be merged into M58 and M59,
I would prefer to keep it as small as possible.
BUG=712615
Review-Url: https://codereview.webrtc.org/2835553002
Cr-Commit-Position: refs/heads/master@{#17799}
d41af462fb