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This CL returns to the simple direct blit code path we had before.
In CL https://chromium-review.googlesource.com/c/chromium/src/+/758562
the implementation of Canvas2DLayerBridge::WritePixels was changed to
go through the PaintCanvas interface, which required making an extra
copy and force the pixels through an alternate color correction code
path that handles alpha blending correctly.  It turns out that this
detour is unnecessary since alpha blending does not come into play in
putImageData since it is a straight blit.

BUG=802081

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I3af99cc56745f6db52921282d905f73981675926
Reviewed-on: https://chromium-review.googlesource.com/883770Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Commit-Queue: Justin Novosad <junov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531723}