Android video capture devices are allowed to report supported pixel formats as UNKNOWN to indicate that the format is not determined until the actual capture is started.

Currently, in VideoCaptureDeviceFactoryAndroid::GetSupportedFormats(), these reported formats get dropped, because they caused certain test timeouts in the base, see [1][2].

We need to figure out why the tests timed out, fix the problem, and then make VideoCaptureDeviceFactoryAndroid::GetSupportedFormats() correctly report the supported pixel format as UNKNOWN back to the caller.

[1]  https://crbug.com/644910 
[2] https://cs.chromium.org/chromium/src/media/capture/video/android/video_capture_device_factory_android.cc?q=video_capture_device_factory_android&dr=C&l=116