cc: Implement test task runner for tests.

This patch implements simple task runner which handles single task.
The functions provided in the class can be used for operating over
task.

BUG=599863
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review-Url: https://codereview.chromium.org/1997743002
Cr-Commit-Position: refs/heads/master@{#396246}
6 files changed