chromium_trybot: also run blink tests for third_party/harfbuzz-ng CLs
chromium_trybot: also run blink tests for third_party/harfbuzz-ng CLs

BUG=546901

Review URL: https://codereview.chromium.org/1419573010

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@297355 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build