JS Tests - Group output logs.
JS Tests - Group output logs.

Use console.group to group logs together for better readability.
JSUnit: https://screenshot.googleplex.com/COcdqpMYaLm.png
Karma: https://screenshot.googleplex.com/XNa9ngjAKZO.png

RELNOTES: Group test logs together for better output readability.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=219431308

lucidsoftware/closure-library,google/closure-library,google/closure-library,teppeis/closure-library,google/closure-library,lucidsoftware/closure-library,google/closure-library,lucidsoftware/closure-library,teppeis/closure-library,teppeis/closure-library,google/closure-library,lucidsoftware/closure-library,teppeis/closure-library