zijiehe 4ff4208c21 Output DeviceName from various windows ScreenCapturer related implementations
Both DXGI_OUTPUT_DESC and DISPLAY_DEVICE contain the DeviceName, which may be
able to map a DirectX screen id with the GDI screen id.
So this change exports the field from both DirectX and GDI implementations.

BUG=webrtc:7950

Review-Url: https://codereview.webrtc.org/2971393002
Cr-Commit-Position: refs/heads/master@{#19010}
2017-07-13 23:05:24 +00:00
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