[android] Set platform to 16 for 32 bit builds.
[android] Set platform to 16 for 32 bit builds.

TBR=ulan, jochen
NOTRY=true

Review URL: https://codereview.chromium.org/1209453003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#29252}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh