Bug 1619038 [wpt PR 22027] - WPT: Upstream and add some transaction s…

…cheduling tests, a=testonly

Automatic update from web-platform-tests
WPT: Upstream and add some transaction scheduling tests (#22027)

In service of w3c/IndexedDB#253 move some
transaction scheduling tests from Blink to WPT.

This involved converting them from js-test.js to testharness.js, but
the overall logic of each test was retained.

This also adds one new test which verifies the change described
in w3c/IndexedDB#319 - all browsers implicitly
block R-O transactions behind overlapping R/W transactions.

Change-Id: I596aaa75b79bf3bf3e17a2553abb4e11329d59ab
Bug: 921193
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2081237
Reviewed-by: Daniel Murphy <dmurphchromium.org>
Commit-Queue: Joshua Bell <jsbellchromium.org>
Auto-Submit: Joshua Bell <jsbellchromium.org>
Cr-Commit-Position: refs/heads/master{#746553}

Co-authored-by: Joshua Bell <inexorabletashgmail.com>

--

wpt-commits: 5e1160e543827227c05b10c7660795436a76b307
wpt-pr: 22027

UltraBlame original commit: 6b1929e476680a2aafc78037914b756199333f09

testing/web-platform/tests/IndexedDB/support.js

@@ -1081,3 +1081,38 @@ false
 }
 ;
 }
+function
+barrier_func
+(
+count
+func
+)
+{
+let
+n
+=
+0
+;
+return
+(
+)
+=
+>
+{
+if
+(
++
++
+n
+=
+=
+=
+count
+)
+func
+(
+)
+;
+}
+;
+}