test: teach test reporter to highlight test stackframe on failures. (#1930)
test: teach test reporter to highlight test stackframe on failures. (#1930)

This patch teaches reporter to highlight test stack frame on
test failures.

puppeteer/puppeteer,puppeteer/puppeteer,GoogleChrome/puppeteer,GoogleChrome/puppeteer,GoogleChrome/puppeteer,puppeteer/puppeteer,puppeteer/puppeteer