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This constitutes a part of change to enable NDK translation on ARCVM.
We identify the binary translation type (None/Houdini/NDK translation)
by seeing USE flags passed from Chrome OS. This information on the
binary translation type is passed to Android via the property
androidboot.native_bridge, which can be accessed as
ro.boot.native_bridge.

BUG=b:139480143
TEST=components_unittests
TEST=Edit /etc/ui_use_flags.txt, and run getprop after restarting ui

Change-Id: Id5810369f3c4e82fda54ed9d2b32be3ad168723e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2071675Reviewed-by: Satoshi Niwa <niwa@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: Youkichi Hosoi <youkichihosoi@chromium.org>
Auto-Submit: Youkichi Hosoi <youkichihosoi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747219}