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This CL updates the MFAttributes we use for video capture on Windows. By
default, we only include MFAttributes for RGB color cameras. So, the
resulting device enumeration contains only RGB cameras.

When the newly added `kIncludeIRCamerasInDeviceEnumeration` feature flag
is enabled, we also include MFAttributes for IR cameras. The resulting
device enumeration contains both RGB and IR cameras.

Testing:
Created versions of the GetDevicesInfo unittest with the feature flag
enabled, and with it disabled.

Bug: 1144049
Change-Id: Id234413f5125e866be5177141decfc9a68bc2fd8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631409Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Rahul Singh <rahsin@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#846260}