Increase kMaxExtensionNames https://github.com/KhronosGroup/Vulkan-Tools/pull/502 adds new extensions, so 200 is no longer enough. Bumping up to 400. Bug: chromium:1201987 Change-Id: Icbad7637649c2236a8c46e577c1c0bd0dbccd633 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2848487 Commit-Queue: Yuly Novikov <ynovikov@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>