layout: Add support for white-space-collapse: break-spaces (#32388)

This change adds support for `white-space-collapse: break-spaces` and
adds initial parsing support for `overflow-wrap` and `word-break`. The
later two properties are not fully supported, only in their interaction
with `break-spaces`. This is a preliminary change preparing to implement
them.

In addition, `break_and_shape` is now forked and added to Layout 2020.
This function is going to change a lot soon and forking is preparation
for this. More code that is only used by Layout 2013 is moved from `gfx`
to that crate.

Co-authored-by: Rakhi Sharma <atbrakhi@igalia.com>

components/gfx/text/glyph.rs

@@ -3,6 +3,7 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 use std::cmp::{Ordering, PartialOrd};
+use std::sync::Arc;
 use std::vec::Vec;
 use std::{fmt, mem, u16};
 
@@ -773,3 +774,24 @@ impl<'a> Iterator for GlyphIterator<'a> {
         }
     }
 }
+
+/// A single series of glyphs within a text run.
+#[derive(Clone, Debug, Deserialize, Serialize)]
+pub struct GlyphRun {
+    /// The glyphs.
+    pub glyph_store: Arc<GlyphStore>,
+    /// The byte range of characters in the containing run.
+    pub range: Range<ByteIndex>,
+}
+
+impl GlyphRun {
+    pub fn compare(&self, key: &ByteIndex) -> Ordering {
+        if *key < self.range.begin() {
+            Ordering::Greater
+        } else if *key >= self.range.end() {
+            Ordering::Less
+        } else {
+            Ordering::Equal
+        }
+    }
+}