In case ScreenCast portal fails right at the beginning, we need to check
the response before trying to get session handle to avoid accessing
non-existing portal data.
Also on early failure do not continue making source request if we failed
before and don't have session handle.
Bug: webrtc:13429
Change-Id: I2bfbd2c6e96e3cda1e62aa9dc07f66d4c7496b53
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/272400
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Mark Foltz <mfoltz@chromium.org>
Commit-Queue: Mark Foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#37872}
65a9a515b5