zijiehe 6dd77c4d89 Add reference counter of DxgiDuplicatorController to unload DXGI components
On Windows, only four applications can use DXGI duplication APIs concurrently.
So this change adds a reference counter of DxgiDuplicatorController to unload
DXGI components when the reference counter reaches 0.

BUG=webrtc:7808

Review-Url: https://codereview.webrtc.org/2933893003
Cr-Commit-Position: refs/heads/master@{#18668}
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Name: WebRTC
URL: http://www.webrtc.org
Version: 90
License: BSD
License File: LICENSE

Description:
WebRTC provides real time voice and video processing
functionality to enable the implementation of 
PeerConnection/MediaStream.

Third party code used in this project is described 
in the file LICENSE_THIRD_PARTY.