buildbot_test_toolchains: Use LATEST-master as control group
Rather than finding the official image with exact the same version
as the trybot image, let's just use the latest one since trybot
always get lastest or latest + 1.
This also solves the problem that the official image specified may
not exist.
BUG=chromium:674652
TEST=Tested ToolchainComparator._GetVanillaImageName locally.
Change-Id: I44fbceb99d8f6cf3187366c075c2a9522869b5a5
Reviewed-on: https://chrome-internal-review.googlesource.com/312516
Commit-Ready: Ting-Yuan Huang <laszio@google.com>
Tested-by: Ting-Yuan Huang <laszio@google.com>
Reviewed-by: Caroline Tice <cmtice@google.com>
2 files changed