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This CL make libgav1 library built on ChromeOS ARM. VideoDecoder
using libgav1, Gav1VideoDecoder, is also available on ChromeOS
ARM. The VideoDecoder is enabled by the chrome option,
--enable-features=Gav1VideoDecoder.

The chrome binary size (bytes) increases as follows for kevin (CrOS ARM 32bit);
No dav1d/libgav1: 120,898,388
dav1d (ToT)     : 121,397,308 (+  498,920 bytes)
libgav1         : 121,760,372 (+  861,984 bytes)
libgav1 + dav1d : 122,255,484 (+1,357,096 bytes)

Bug: 1047051
Test: Build chrome
Test: Gav1VideoDecoder is used on kevin with --enable-features=Gav1VideoDecoder
Change-Id: I0fae28bf390e2f3f421411ad2617f153df8f191d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028875Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: James Zern <jzern@google.com>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752715}