Rationale:
When building with "--precompile trace.txt", the current
version silently processes the file without any feedback
on misspelled names, errors, or the like. This flag adds
the ability to get some feedback.
Change-Id: Iccf4b53c7091aac8be5e207eaf00273ceeeda4f3
Reviewed-on: https://dart-review.googlesource.com/75790
Commit-Queue: Aart Bik <ajcbik@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Aart Bik