Capture/Replay: Handle missing context serialization Some ContextLost* tests do weird things with the context serialization which results in a mis-match of available context serializations. In this case check whether both serializations are missing, if so consider this to be an equal contexts states, otherwise, if only one serialization is available, report failure. While touching this code, also remove an unused parameter from the context serialization compare function. Disable tests that still fail with this change. Bug: angleproject:6157 Change-Id: Iee6cc7d65437112e38919cff59804e2b7f9467da Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3021061 Commit-Queue: Gert Wollny <gert.wollny@collabora.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com>