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The Obu parser implementation in libgav1 will be used in hardware
accelerators on ChromeOS x86/x64. This CL builds libgav1
on ChromeOS x86/64. Thanks to the linker swiping unnecessary
objects, the chrome binary size increases by 43 kbytes
(= 191087912 - 191040232, 0.025% in ratio) with an av1 hardware
accelerator implementation (crrev.com/c/1921588).

Bug: 1029212
Test: Build chrome for chromeos x86
Change-Id: Ie9f0b3b551e3ea5138cc5ed85536498a9166da86
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2397596
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: James Zern <jzern@google.com>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817345}