Prefer F16 in SkAndroidCodec for high precision images

Adapted from:
https://googleplex-android-review.git.corp.google.com/#/c/1707531/

TBR=djsollen@google.com
BUG=skia:

Change-Id: I21b99e8452e728aed70e8913677c253c1ae9f751
Reviewed-on: https://skia-review.googlesource.com/6023
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
2 files changed