- output 'glDrawArrays' instead of 'DrawArrays'
- output context IDs for multithreaded scenarios
- output to trace even when platform logging is on
- fix newlines in trace file output

Bug: angleproject:3815
Change-Id: Ie07c5c91d9eae6204aaf6f6319ef318b88d292aa
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1761163
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>