style: Replicate the list of stylesheets on the layout thread.

[emilio]

This is a patch that unifies a bit how Gecko and Stylo stylesheets work, in
order to be able to eventually move the stylesheets into the stylist, and be
able to incrementally update the invalidation map.

This is on top of #18113

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This change is 

[highfive]

Heads up! This PR modifies the following files:

• @bholley: components/style/invalidation/stylesheets.rs, components/style/stylesheet_set.rs, components/style/stylist.rs
• @canaltinova: components/style/invalidation/stylesheets.rs, components/style/stylesheet_set.rs, components/style/stylist.rs
• @fitzgen: components/script/dom/document.rs, components/script/dom/htmllinkelement.rs, components/script/dom/node.rs, components/script/dom/htmlstyleelement.rs, components/script/dom/bindings/trace.rs and 4 more
• @KiChjang: components/script/dom/document.rs, components/script/dom/htmllinkelement.rs, components/script/dom/node.rs, components/script/dom/htmlstyleelement.rs, components/script/dom/bindings/trace.rs and 4 more

[highfive]

Warning

• These commits modify unsafe code. Please review it carefully!
• These commits modify style and script code, but no tests are modified. Please consider adding a test!

[emilio]

@bors-servo try

[bors-servo]

⌛ Trying commit e34c51d with merge 73d1357...

[bors-servo]

💔 Test failed - android

[emilio]

r? @SimonSapin

[SimonSapin]

Reviewed 1 of 1 files at r1, 1 of 1 files at r2, 1 of 1 files at r3, 13 of 13 files at r4.
Review status: all files reviewed at latest revision, 2 unresolved discussions, some commit checks failed.

---

components/script/dom/document.rs, line 2399 at r4 (raw file):

        let mut stylesheets = self.stylesheets.borrow_mut();
        let insertion_point = stylesheets.iter().find(|sheet_in_doc| {
            sheet_in_doc.owner.upcast::<Node>().is_before(owner.upcast())

Shouldn’t this be owner.upcast::<Node>().is_before(sheet_in_doc.owner.upcast())?

---

components/script/dom/node.rs, line 2395 at r2 (raw file):

        }

        let mut parent = self_and_ancestors.pop().unwrap();

Nit: parent is not the parent of any particular node we’ve been manipulating so far. Maybe call it shared_ancestor?

---

Comments from Reviewable

[SimonSapin]

Shouldn’t this be owner.upcast::().is_before(sheet_in_doc.owner.upcast())?

r=me with that fixed.

[emilio]

Great catch, Simon :)

@bors-servo try

[bors-servo]

⌛ Trying commit 1394a0e with merge 9a5b0a4...

[bors-servo]

💔 Test failed - linux-dev

[SimonSapin]

Checking files for tidiness...

./components/script/dom/document.rs:142: use statement is not in alphabetical order
	expected: style::shared_lock::SharedRwLockReadGuard
	found: style::shared_lock::SharedRwLock as StyleSharedRwLock

./components/script/dom/document.rs:145: use statement is not in alphabetical order
	expected: style::stylesheets::{Stylesheet, StylesheetContents, OriginSet}
	found: style::stylesheet_set::StylesheetSet

./components/layout_thread/lib.rs:135: use statement is not in alphabetical order
	expected: style::properties::PropertyId
	found: style::invalidation::media_queries::{MediaListKey, ToMediaListKey}

./components/layout_thread/lib.rs:140: use statement is not in alphabetical order
	expected: style::stylesheets::{Origin, OriginSet, Stylesheet, StylesheetContents, StylesheetInDocument, UserAgentStylesheets}
	found: style::stylesheet_set::StylesheetSet

[emilio]

@bors-servo try

[bors-servo]

⌛ Trying commit 3446372 with merge 307478b...

[emilio]

@bors-servo r=SimonSapin p=1

• It's been 2 hours on try :(

[bors-servo]

📌 Commit 3446372 has been approved by SimonSapin

[bors-servo]

📌 Commit 1ddef08 has been approved by SimonSapin

[bors-servo]

⌛ Testing commit 1ddef08 with merge 495a083...

[bors-servo]

💔 Test failed - mac-rel-wpt3

[emilio]

@bors-servo retry

• Generic exception?

[bors-servo]

⌛ Testing commit 1ddef08 with merge bc4b67d...

[bors-servo]

💔 Test failed - mac-rel-wpt4

[emilio]

@bors-servo r=SimonSapin

[bors-servo]

📌 Commit d1725b1 has been approved by SimonSapin

[bors-servo]

⌛ Testing commit d1725b1 with merge 81a382c...

[bors-servo]

☀️ Test successful - android, arm32, arm64, linux-dev, linux-rel-css, linux-rel-wpt, mac-dev-unit, mac-rel-css1, mac-rel-css2, mac-rel-wpt1, mac-rel-wpt2, mac-rel-wpt3, mac-rel-wpt4, windows-msvc-dev
Approved by: SimonSapin
Pushing 81a382c to master...