GitLab

Also:
 * Default the arg to true for all release builds that contain debug info.
   (most bots set strip_debug_info=true though)
 * Add better failure messages for when no debug info is present.

Bug: 864878
Change-Id: Ied849d6e24a672b896c802be6df6c0958ecabfe0
Reviewed-on: https://chromium-review.googlesource.com/1142193
Commit-Queue: agrieve <agrieve@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588734}