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This CL replaces memcpy with libyuv::CopyPlane since the copy
processing is the same as libyuv::CopyPlane.

Bug: None
Change-Id: Ib9f4e476ea2e18de5cf99c8c97e665f7ed3d1996
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2439679Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Zhaoliang Ma <zhaoliang.ma@intel.com>
Cr-Commit-Position: refs/heads/master@{#815548}