Reland Input type=text Shadow DOM With Performance Improvement (#37483)

Depends on #37427.

In addition to the changes introduced by
https://github.com/servo/servo/pull/37065, there are several performance
improvements and nits as follows:
- Use the internal pseudo element for style matching, this will reduce
the performance regression by ~66%.
- Manual construction of the `Text` node inside a text container. This
is followed by the modification of the inner `Text` node instead of
using `SetTextContent` which is more expensive.
- Use `implemented_pseudo_element` instead of
`text_control_inner_editor` `NodeFlag` to handle the special cases that
these elements should follow, specifically the:
  - focus delegation workaround;
  - selections; and
  - line height resolving.
- More documentation.

Servo's side of: https://github.com/servo/stylo/pull/217

Testing: No new unexpected WPT failure, except for the one introduced by
https://github.com/servo/servo/pull/37065/.
Fixes: #36307 #37205

---------

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>

components/script/layout_dom/node.rs

@@ -18,6 +18,7 @@ use layout_api::{
 use net_traits::image_cache::Image;
 use pixels::ImageMetadata;
 use range::Range;
+use selectors::Element as _;
 use servo_arc::Arc;
 use servo_url::ServoUrl;
 use style;
@@ -28,7 +29,7 @@ use style::selector_parser::PseudoElement;
 use super::{
     ServoLayoutDocument, ServoLayoutElement, ServoShadowRoot, ServoThreadSafeLayoutElement,
 };
-use crate::dom::bindings::inheritance::{CharacterDataTypeId, NodeTypeId, TextTypeId};
+use crate::dom::bindings::inheritance::NodeTypeId;
 use crate::dom::bindings::root::LayoutDom;
 use crate::dom::element::{Element, LayoutElementHelpers};
 use crate::dom::node::{LayoutNodeHelpers, Node, NodeFlags, NodeTypeIdWrapper};
@@ -101,6 +102,18 @@ impl<'dom> ServoLayoutNode<'dom> {
     pub fn is_text_input(&self) -> bool {
         self.node.is_text_input()
     }
+
+    pub fn is_text_container_of_single_line_input(&self) -> bool {
+        self.node.is_text_container_of_single_line_input()
+    }
+
+    pub fn is_in_ua_widget(&self) -> bool {
+        self.node.is_in_ua_widget()
+    }
+
+    pub fn containing_shadow_host(&self) -> Option<ServoLayoutNode> {
+        Some(self.as_element()?.containing_shadow_host()?.as_node())
+    }
 }
 
 impl style::dom::NodeInfo for ServoLayoutNode<'_> {
@@ -109,8 +122,7 @@ impl style::dom::NodeInfo for ServoLayoutNode<'_> {
     }
 
     fn is_text_node(&self) -> bool {
-        self.script_type_id() ==
-            NodeTypeId::CharacterData(CharacterDataTypeId::Text(TextTypeId::Text))
+        self.node.is_text_node_for_layout()
     }
 }