Add closure_compile build flag.

This CL adds a closure_compile build flag which is set to compile on
the android, linux and chromeos trybots. This flag causes the js_type_check
target to no-op by generating an empty group() target.

Bug: 820473
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I77e2fdbb9bb7881cf0cb335bad0978c8532ea539
Reviewed-on: https://chromium-review.googlesource.com/958308
Reviewed-by: Scott Violet <[email protected]>
Reviewed-by: Dirk Pranke <[email protected]>
Commit-Queue: calamity <[email protected]>
Cr-Commit-Position: refs/heads/master@{#546398}
7 files changed