Create NaCl build of gtest.

Originally landed as 289216 and reverted as 289223 due to a GYP bug.

BUG=401761

Review URL: https://codereview.chromium.org/401453002

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@289558 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
Convert linux_browser_asan builder to recipe

This CL adds the json file containing test_spec for linux_browser_asan.

BUG=399730
NOTRY=true

Review URL: https://codereview.chromium.org/471963002

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@289571 4ff67af0-8c30-449e-8e8b-ad334ec8d88c