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On GPUs that only supports FP16 arithmetic, just doing
a copy between the same size of large (>1024px) rectangles
already introduces some imprecision. Using GL_NEAREST in
such a case increases the quality and produces results
closer to pixel-perfect copying.

BUG=b:141898654
TEST=android.view.cts.SurfaceViewSyncTest#testSmallRect on kukui (ChromeOS)

Change-Id: I2d58ee387122b3977e8e3f439179ce01ff5bf14d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076642Reviewed-by: Peng Huang <penghuang@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: Kazuhiro Inaba <kinaba@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745220}