Make it possible to build the style_traits crate with a stable compiler.

Testing this on CI to make sure we don’t regress it is blocked on #11806

1 files changed, 5 insertions, 3 deletions

diff --git a/components/util/geometry.rs b/components/util/geometry.rs
index 813cad3aa3d..d750131f151 100644
--- a/components/util/geometry.rs
+++ b/components/util/geometry.rs
@@ -23,7 +23,7 @@ use std::i32;
 ///
 /// The ratio between ScreenPx and DevicePixel for a given display be found by calling
 /// `servo::windowing::WindowMethods::hidpi_factor`.
-#[derive(Clone, Copy, Debug, HeapSizeOf)]
+#[derive(Clone, Copy, Debug)]
 pub enum ScreenPx {}
 
 /// One CSS "px" in the coordinate system of the "initial viewport":
@@ -35,7 +35,7 @@ pub enum ScreenPx {}
 ///
 /// At the default zoom level of 100%, one PagePx is equal to one ScreenPx.  However, if the
 /// document is zoomed in or out then this scale may be larger or smaller.
-#[derive(Clone, Copy, Debug, HeapSizeOf)]
+#[derive(Clone, Copy, Debug)]
 pub enum ViewportPx {}
 
 /// One CSS "px" in the root coordinate system for the content document.
@@ -44,9 +44,11 @@ pub enum ViewportPx {}
 /// This is the mobile-style "pinch zoom" that enlarges content without reflowing it.  When the
 /// viewport zoom is not equal to 1.0, then the layout viewport is no longer the same physical size
 /// as the viewable area.
-#[derive(Clone, Copy, Debug, HeapSizeOf)]
+#[derive(Clone, Copy, Debug)]
 pub enum PagePx {}
 
+known_heap_size!(0, ScreenPx, ViewportPx, PagePx);
+
 // In summary, the hierarchy of pixel units and the factors to convert from one to the next:
 //
 // DevicePixel