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These tests where marked as Fail: ToT crashed when running e.g. [1]
with chrome://flags/#enable-experimental-web-platform-features.

- Pixel_CanvasUnacceleratedLowLatency2D: is kept disabled on Android
because software compositing doesn't work at all; this test is
changed from Fail() to Skip() and bundled with similar expectations.
Other similar android-sw-compositor expectations are updated and
gathered in the same area for better reference (there are no plans
whatsoever to make this compositor mode work on Android)

- Pixel_CanvasLowLatency2D: I landed a fix recently for a crash
(crrev.com/c/1297469), with that the test works but produces a
sliiiightly different output (see e.g. the first row of [2]), so we
have to rebaseline the reference images. For that, the first step
is to mark the test as disabled for all platforms.

[1] http://htmlpreview.github.io/?https://github.com/chromium/chromium/blob/HEAD/content/test/data/gpu/pixel_canvas_low_latency_2d.html
[2] http://chromium-browser-gpu-tests.commondatastorage.googleapis.com/view_test_results.html?868948046954e7d06d97eb10544ea3b27b320953_android_marshmallow_arm64_rel_telemetry

Bug: 865957
Change-Id: I45ccbc0a674cb6eb51f622d7c7af039162a2c071
Reviewed-on: https://chromium-review.googlesource.com/c/1294870Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603677}