Bug 1688868 [wpt PR 27329] - Mark some WPT tests as timeout=long, a=testonly

Bug 1688868 [wpt PR 27329] - Mark some WPT tests as timeout=long, a=testonly

Automatic update from web-platform-tests
Mark some WPT tests as timeout=long

A recent change in testharness.js seems to have caused a detectable
performance regression on the MSAN bots. We intend to follow through on
this to see if it can be avoided, but for now there are 3 tests that are
consistently timing out on MSAN that did not previously:

external/wpt/encoding/textdecoder-labels.any.worker.html
external/wpt/html/canvas/offscreen/text/2d.text.draw.fill.maxWidth.zero.worker.html
external/wpt/url/url-constructor.any.worker.html

This CL adds 'long' timeouts to each of the tests. Unfortunately the
canvas test is part of a generated test suite, so far that I added
support for 'timeout=long' to the worker variant of gentestutils.py...
and discovered ~20 other test files that were already marked as having a
long timeout but weren't previously generating the correct code! So they
unfortunately get bundled in with this.

Bug: 1170588
Change-Id: I3b471b3a21b4e9f8c126f4e012c7f9949636e4b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2648976
Reviewed-by: Yi Xu <yiyix@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#847254}

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wpt-commits: 473c0c1c14bf24d72dc11f6b58d822f4acce4fab
wpt-pr: 27329