Added compiler flags to enable Control Flow Guard.
Added compiler flags to enable Control Flow Guard.

Change-Id: I86e24b83e2e9b279c93c518ab9bc7dafd4b3d006
Reviewed-on: https://chromium-review.googlesource.com/272501
Reviewed-by: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>
Tested-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

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