Add win_gpu to the default set of try servers for Blink CLs.
Add win_gpu to the default set of try servers for Blink CLs.

This configuration is successfully handling the experimental load from
the Chromium and Blink commit queues. Expand its testing.

BUG=353864

Review URL: https://codereview.chromium.org/253873007

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@172839 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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