Bug 1642484 [wpt PR 23900] - Remove MainThreadScrollingReasons::kHasC…

…lipRelatedProperty, a=testonly

Automatic update from web-platform-tests
Remove MainThreadScrollingReasons::kHasClipRelatedProperty

We no longer need to skip composited scrolling for css clip and
clip-path since (perhaps) BlinkGenPropertyTrees.

In compositor, when we hit test on a layer with special clip/mask,
we'll still fallback to main thread hit testing/scrolling because only
the main thread knows which area is hit testable. This is achieved by
 cc::LayerTreeHostImpl::IsInitialScrollHitTestReliable() returning false.

Bug: 1074395
Change-Id: I91260b063879812ca82928fe783de25c4b6732a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225229
Commit-Queue: Xianzhu Wang <wangxianzhuchromium.org>
Reviewed-by: Philip Rogers <pdrchromium.org>
Reviewed-by: Robert Flack <flackrchromium.org>
Reviewed-by: David Bokan <bokanchromium.org>
Cr-Commit-Position: refs/heads/master{#774232}

--

wpt-commits: 4c2484a55b58a72b74c0b6c55ab0238cf11efb4a
wpt-pr: 23900

Differential Revision: https://phabricator.services.mozilla.com/D78793

UltraBlame original commit: f3c2bc8c1eb7f797acd6f0b036e4019332e6c6b3

testing/web-platform/tests/css/css-masking/clip-path/clip-path-scroll.html

@@ -0,0 +1,272 @@
+<
+!
+DOCTYPE
+html
+>
+<
+title
+>
+CSS
+Masking
+:
+Test
+clip
+-
+path
+property
+with
+overflow
+:
+scroll
+<
+/
+title
+>
+<
+link
+rel
+=
+"
+help
+"
+href
+=
+"
+http
+:
+/
+/
+www
+.
+w3
+.
+org
+/
+TR
+/
+css
+-
+masking
+-
+1
+/
+#
+clip
+-
+path
+-
+property
+"
+>
+<
+link
+rel
+=
+"
+match
+"
+href
+=
+"
+reference
+/
+clip
+-
+path
+-
+scroll
+-
+ref
+.
+html
+"
+>
+<
+html
+class
+=
+"
+reftest
+-
+wait
+"
+>
+<
+p
+>
+The
+test
+passes
+if
+there
+is
+a
+green
+square
+containing
+text
+(
+which
+can
+be
+scrolled
+with
+mouse
+wheel
+or
+touch
+)
+.
+No
+scrollbars
+should
+be
+seen
+.
+<
+/
+p
+>
+<
+div
+id
+=
+"
+target
+"
+style
+=
+"
+clip
+-
+path
+:
+polygon
+(
+10px
+10px
+10px
+100px
+100px
+100px
+100px
+10px
+)
+;
+width
+:
+200px
+;
+height
+:
+200px
+;
+overflow
+:
+scroll
+;
+background
+:
+red
+"
+>
+<
+div
+style
+=
+"
+position
+:
+relative
+;
+top
+:
+100px
+;
+width
+:
+100px
+;
+height
+:
+100px
+;
+background
+:
+green
+"
+>
+<
+/
+div
+>
+<
+div
+style
+=
+"
+height
+:
+1000px
+"
+>
+<
+/
+div
+>
+<
+/
+div
+>
+<
+script
+>
+requestAnimationFrame
+(
+(
+)
+=
+>
+{
+requestAnimationFrame
+(
+(
+)
+=
+>
+{
+target
+.
+scrollTop
+=
+100
+;
+document
+.
+documentElement
+.
+classList
+.
+remove
+(
+"
+reftest
+-
+wait
+"
+)
+;
+}
+)
+;
+}
+)
+;
+<
+/
+script
+>
+<
+/
+html
+>

testing/web-platform/tests/css/css-masking/clip-path/reference/clip-path-scroll-ref.html

@@ -0,0 +1,75 @@
+<
+!
+DOCTYPE
+html
+>
+<
+p
+>
+The
+test
+passes
+if
+there
+is
+a
+green
+square
+containing
+text
+(
+which
+can
+be
+scrolled
+with
+mouse
+wheel
+or
+touch
+)
+.
+No
+scrollbars
+should
+be
+seen
+.
+<
+/
+p
+>
+<
+div
+style
+=
+"
+position
+:
+relative
+;
+top
+:
+10px
+;
+left
+:
+10px
+;
+width
+:
+90px
+;
+height
+:
+90px
+;
+background
+:
+green
+"
+>
+<
+/
+div
+>