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memcpy is used to copy a linear buffer to the dst linear buffer, this CL
replaces it with libyuv::CopyPlane.

Bug: None
Test: viz_perftests --gtest_filter=GLRendererCopierPerfTest.*
Change-Id: I4892329e243e2fd577a7571f65b7c33a150ff90a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2373947
Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802020}