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This patch changes the float precision from 'mediump' to 'highp'. This
is needed for android.

Bug: 1009322
Test: Manually tested various websites that were reported on the bug
Change-Id: I87b57d57c43093b590741393dfef3c75c151c1cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913708
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719419}