Updated ARM test specs

Since chromium and chromium_trybot recipes expect different test spec file
format, chromium_arm.json cannot be used by chromium isolate, so duplicating
the test spec in chromium.fyi.json. Also we might want different set of tests
in these recipes.

Test spec may have compile targets. Had to change chromium_arm.json and
chromium_trybot.json format to include them. For backward compatibility,
chromium_trybot recipe will continue accepting an array as a test spec, until
this is committed. After that the old format support will be removed.

Removed cmd line args from chromium_arm.json because at the moment they
cannot be transferred to a tester with the current infrastructure.

Removed descriptions (comments) from test specs per phajdan.jr's
request.

R=phajdan.jr@chromium.org, vadimsh@chromium.org
BUG=359338

Review URL: https://codereview.chromium.org/297303012

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@273746 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
Add mojo unittests to Windows main waterfall bots.

BUG=None
TEST=None
R=phajdan.jr@chromium.org

Review URL: https://codereview.chromium.org/296113011

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@273898 4ff67af0-8c30-449e-8e8b-ad334ec8d88c