This change introduces the design that will allow us to deliver frames
synchronously to callers despite the Windows.Graphics.Capture APIs being
inherently asynchronous.
We achieve this by having WindowCapturerWinWgc create and maintain a
WgcCaptureSession object for each window that it is asked to capture a
frame for. The capture session object will be the class that actually
uses the WGC APIs, and it will store the frames it receives in a frame
pool and deliver them via GetMostRecentFrame.
The next CL will add the necessary functionality to the
WgcCaptureSession class.
Bug: webrtc:9273
Change-Id: I44e164f4874503d8ccc8e6a210e74f9c8458f6c4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/184220
Commit-Queue: Austin Orion <auorion@microsoft.com>
Reviewed-by: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32240}
e820cef534