Auto merge of #29728 - Loirooriol:sync-fontprovider-D157589, r=mrobinson

Simplify our setup for font metric queries from style

This is a backport of https://phabricator.services.mozilla.com/D157589,
by Emilio Cobos Álvarez, plus some additions so that Servo compiles,
and some parts from https://phabricator.services.mozilla.com/D144455.

Should have no change in behavior.

<!-- Please describe your changes on the following line: -->

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #___ (GitHub issue number if applicable)

<!-- Either: -->
- [ ] There are tests for these changes OR
- [X] These changes do not require tests because there should be no change in behavior

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

1 files changed, 17 insertions, 0 deletions

diff --git a/components/style/servo/media_queries.rs b/components/style/servo/media_queries.rs
index 17949c723d0..4b535a9b875 100644
--- a/components/style/servo/media_queries.rs
+++ b/components/style/servo/media_queries.rs
@@ -6,6 +6,7 @@
 
 use crate::context::QuirksMode;
 use crate::custom_properties::CssEnvironment;
+use crate::font_metrics::FontMetrics;
 use crate::media_queries::media_feature::{AllowsRanges, ParsingRequirements};
 use crate::media_queries::media_feature::{Evaluator, MediaFeatureDescription};
 use crate::media_queries::media_feature_expression::RangeOrOperator;
@@ -156,6 +157,22 @@ impl Device {
         self.device_pixel_ratio
     }
 
+    /// Queries dummy font metrics for Servo. Knows nothing about fonts and does not provide
+    /// any metrics.
+    /// TODO: Servo's font metrics provider will probably not live in this crate, so this will
+    /// have to be replaced with something else (perhaps a trait method on TElement)
+    /// when we get there
+    pub fn query_font_metrics(
+        &self,
+        _vertical: bool,
+        _font: &crate::properties::style_structs::Font,
+        _base_size: CSSPixelLength,
+        _in_media_query: bool,
+        _retrieve_math_scales: bool,
+    ) -> FontMetrics {
+        Default::default()
+    }
+
     /// Take into account a viewport rule taken from the stylesheets.
     pub fn account_for_viewport_rule(&mut self, constraints: &ViewportConstraints) {
         self.viewport_size = constraints.size;