Adding test log creation to page load test runner. Adding test start/end timestamps to new test log.
Adding test log creation to page load test runner.
Adding test start/end timestamps to new test log.

Review URL: http://codereview.chromium.org/42420

git-svn-id: http://src.chromium.org/svn/trunk/src@12199 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 5e0a5f85a8676c5596487c8402012acd933d3a86
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser