The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/tools/build/+/c05a46e0a3512f5a106e1b407b355e3416a100d9

commit c05a46e0a3512f5a106e1b407b355e3416a100d9
Author: Yuke Liao <liaoyuke@chromium.org>
Date: Wed May 30 19:46:23 2018

Coverage: Add a step to read clang revision on coverage tot builders.

This CL adds a step to show the clang revision for debugging purpose.

Bug:  846869 
Change-Id: Idf81598e26a43a495f07e5ffb9cdbd48f2e83939
Reviewed-on: https://chromium-review.googlesource.com/1078069
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>

[modify] https://crrev.com/c05a46e0a3512f5a106e1b407b355e3416a100d9/scripts/slave/recipes/chromium_clang_coverage_tot.expected/full_chromium_clang_ToTLinuxCoverage.json
[modify] https://crrev.com/c05a46e0a3512f5a106e1b407b355e3416a100d9/scripts/slave/recipes/chromium_clang_coverage_tot.expected/full_chromium_clang_ToTMacCoverage.json
[modify] https://crrev.com/c05a46e0a3512f5a106e1b407b355e3416a100d9/scripts/slave/recipes/chromium_clang_coverage_tot.py

The step is available now, but is hidden behind a link, and can be improved by surfacing the clang revision. Keep this open but lower the priority.