[toolchain-utils]  Add test suite colors to waterfall report.

This CL updates the daily waterfall summary report with the color of
each test suite (green = all passed, red = something failed,
orange = all passed, with some retries).

BUG=None
TEST=Tested generating the reports in my own tree.

Change-Id: I4747ec505a8991e638667ba9744e2572a85c0c4e
Reviewed-on: https://chrome-internal-review.googlesource.com/307858
Commit-Ready: Caroline Tice <cmtice@google.com>
Tested-by: Caroline Tice <cmtice@google.com>
Reviewed-by: Yunlian Jiang <yunlian@google.com>
1 file changed