Why is this blocked on  issue 71903 ?

Can't the WPT tests just track the current spec and change if the spec changes? 

Oops  issue 719303 .

Re c#3, this is because our current impl and layout tests are not in conformance with the current spec, too.

Implementing the current spec needs changes in our bindings layer and implementing the new spec also needs different changes in the bindings layer, so I want to wait until the spec discussion is settled.

 Issue 768389  has been merged into this issue.

CL: https://chromium-review.googlesource.com/c/chromium/src/+/683714

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b03a253cd3778652b4e3983c2424786ff642942c

commit b03a253cd3778652b4e3983c2424786ff642942c
Author: Hiroki Nakagawa <nhiroki@chromium.org>
Date: Thu Sep 28 00:48:01 2017

Worklet: Upstream http/tests/worklet to WPT

This CL upstreams http/tests/worklet to external/wpt/worklets on the WPT
repository.

Bug:  724907 
Change-Id: I0928ea9bd7f615b84cf138a8682816c68a779ed5
Reviewed-on: https://chromium-review.googlesource.com/683714
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504833}
[add] https://crrev.com/b03a253cd3778652b4e3983c2424786ff642942c/third_party/WebKit/LayoutTests/external/wpt/worklets/OWNERS
[add] https://crrev.com/b03a253cd3778652b4e3983c2424786ff642942c/third_party/WebKit/LayoutTests/external/wpt/worklets/README.md
[rename] https://crrev.com/b03a253cd3778652b4e3983c2424786ff642942c/third_party/WebKit/LayoutTests/external/wpt/worklets/animation-worklet-import.html
[add] https://crrev.com/b03a253cd3778652b4e3983c2424786ff642942c/third_party/WebKit/LayoutTests/external/wpt/worklets/paint-worklet-import.html
[rename] https://crrev.com/b03a253cd3778652b4e3983c2424786ff642942c/third_party/WebKit/LayoutTests/external/wpt/worklets/resources/empty-worklet-script.js
[rename] https://crrev.com/b03a253cd3778652b4e3983c2424786ff642942c/third_party/WebKit/LayoutTests/external/wpt/worklets/resources/import-cyclic-worklet-script.js
[rename] https://crrev.com/b03a253cd3778652b4e3983c2424786ff642942c/third_party/WebKit/LayoutTests/external/wpt/worklets/resources/import-nested-internal-worklet-script.js
[rename] https://crrev.com/b03a253cd3778652b4e3983c2424786ff642942c/third_party/WebKit/LayoutTests/external/wpt/worklets/resources/import-nested-worklet-script.js
[rename] https://crrev.com/b03a253cd3778652b4e3983c2424786ff642942c/third_party/WebKit/LayoutTests/external/wpt/worklets/resources/import-tests.js
[rename] https://crrev.com/b03a253cd3778652b4e3983c2424786ff642942c/third_party/WebKit/LayoutTests/external/wpt/worklets/resources/throwing-worklet-script.js
[delete] https://crrev.com/08ac8e55a0db2ca91d1a835d7edb8058def1f399/third_party/WebKit/LayoutTests/http/tests/worklet/paint-worklet-import.html