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See go/closure-compile-gn for details.

This CL converts the Closure Compilation of ChromeOS resources from GYP to
GN.

A local closure compile can be run by setting closure_compile = true in
args.gn, and then running ninja -C out/Default webui_closure_compile.
A more localized compile may look like:
ninja -C out/Default chrome/browser/resources/chromeos:closure_compile

TBR=dpranke@chromium.org, dpapad@chromium.org
TEST=Running the compilation with a type mismatch should cause a failure.

Bug: 632206
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: If1656b63a5571a00f54a913d5295231970eba44e
Reviewed-on: https://chromium-review.googlesource.com/1049350
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566316}