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For now this is used as the flag to enable hardware secure decryption
support on Windows while it's still under development.

Added a TODO to apply this flag to Android and ChromeOS where hardware
secure decryption is already supported.

Bug: 848532
Test: No functionality change.
Change-Id: Ie263008ace5f8da5da1ab94acf22485046a79b7d
Reviewed-on: https://chromium-review.googlesource.com/1103283
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568316}