Starting from version 1607 of Windows 10, there is a SetThreadDescription
API for setting thread names. This API has several advantages over
the SetNameInternal function which is currently used to set thread
names in Chrome.

The only issue with this new API is that there is no tool support
for it yet. However, once tool support catches up, it should give
a better thread naming experience.

A command-line tool "ShowThreadNames" for testing this
SetThreadDescription API has been developed and checked in using
another CL. It can be found via
https://codereview.chromium.org/2713773002

BUG=684203

Review-Url: https://codereview.chromium.org/2692213003
Cr-Commit-Position: refs/heads/master@{#452653}