CDM_10: Update Initialize()

- Add |use_hw_secure_codecs| in Initialize() call
- Add OnInitialized() to allow async initialization

BUG=733821,795366

Change-Id: I3a580c7c547768ed674c0ac13054ee9945dc568a
Reviewed-on: https://chromium-review.googlesource.com/830646
Reviewed-by: John Rummell <jrummell@chromium.org>
1 file changed