While working on this I've found an issue with testharness.js that I've reported in  bug #687492 .

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/91d2f36bd1fd37e7941b68fe85a9e674c4c84882

commit 91d2f36bd1fd37e7941b68fe85a9e674c4c84882
Author: rego <rego@igalia.com>
Date: Wed Feb 01 18:54:08 2017

[css-grid] Import W3C Test Suite

This patch imports the CSS Grid Layout test suite from csswg-test repository.

Currently we're passing most of the but:
* grid-layout-properties.html: An old known bug (crbug.com/511177).
* grid-support-grid-template-areas-001.xht &
  grid-inline-support-grid-template-areas-001.xht: Because of an issue
  with testharness.js ( crbug.com/687492 ).

Additionally I'm skipping the tests related to "Implied Minimum Size
of Grid Items" (https://drafts.csswg.org/css-grid/#min-size-auto),
because the test suite needs to be updated after the CSS WG resolves
the following issue: https://github.com/w3c/csswg-drafts/issues/283
See  crbug.com/666940  for more details.

BUG= 687494 

Review-Url: https://codereview.chromium.org/2670473003
Cr-Commit-Position: refs/heads/master@{#447562}

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[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-layout-z-order-b-expected.html
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-layout-z-order-b.html
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-001-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-001.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-002-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-002.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-003-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-003.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-004-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-004.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-005-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-005.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-006-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-006.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-007-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-007.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-008-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-008.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-009-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-minimum-size-grid-items-009.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-order-property-auto-placement-001-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-order-property-auto-placement-001.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-order-property-auto-placement-002-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-order-property-auto-placement-002.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-order-property-auto-placement-003-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-order-property-auto-placement-003.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-order-property-auto-placement-004-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-order-property-auto-placement-004.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-order-property-auto-placement-005-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-order-property-auto-placement-005.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-order-property-painting-001-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-order-property-painting-001.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-order-property-painting-002-expected.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/grid-items/grid-order-property-painting-002.xht
[add] https://crrev.com/91d2f36bd1fd37e7941b68fe85a9e674c4c84882/third_party/WebKit/LayoutTests/external/csswg-test/css-grid-1/gri

The test suite has been imported, and the new changes on the W3C repository
are being successfully imported.

I think we can close this now.

BTW, the current status is that we're passing the whole test suite but one test:
* grid-layout-properties.html: An old known bug (crbug.com/511177).