Converts IsMashEnabled() to IsAshInProcess()

And adds OopAsh for the new code path.

BUG=837686
TEST=covered by tests

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I5e0dbaccd8974ecf996e7507f0e327fc37c281db
Reviewed-on: https://chromium-review.googlesource.com/1101648
Commit-Queue: Scott Violet <[email protected]>
Reviewed-by: Tom Sepez <[email protected]>
Reviewed-by: James Cook <[email protected]>
Cr-Commit-Position: refs/heads/master@{#567682}
37 files changed