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This feature allow users to export the policies in a JSON file.

Bug: 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I708abc3465ecf2a469979fb7d13b22ed947ed392
Reviewed-on: https://chromium-review.googlesource.com/966590
Commit-Queue: Martin Rodriguez <rodmartin@google.com>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550246}