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We distinguish three cases:
 * Policies that control browser behavior. These implicitly apply to
   Chrome on Chrome OS only. No documentation updates are needed.
 * Policies that affect parts of the system which lie outside the scope
   of ARC, e.g. the login screen and auto-update system. These
   implicitly apply to Chrome OS only. No documentation updates are
   needed.
 * Policies that directly or indirectly influence app behavior. The
   default assumption is that any such policy applies to both Chrome
   and Android apps. This CL adds a note to the generated documentation
   whenever this is not the case.

BUG=b/28039197 b/28109303
TEST=ninja -C out/out policy_templates

Review-Url: https://codereview.chromium.org/2278493004
Cr-Commit-Position: refs/heads/master@{#415140}