layout: Report memory usage for fragment and box trees. (#36553)

Add memory reporter integration for the fragment and box trees that are
persisted in the layout thread.

Testing: Looked at the numbers for https://servo.org and
https://html.spec.whatwg.org/. The former was very small, but the latter
was 700mb.

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

1 files changed, 5 insertions, 4 deletions

diff --git a/components/layout_2020/flow/inline/inline_box.rs b/components/layout_2020/flow/inline/inline_box.rs
index 2eceae944f2..97398d6e708 100644
--- a/components/layout_2020/flow/inline/inline_box.rs
+++ b/components/layout_2020/flow/inline/inline_box.rs
@@ -6,6 +6,7 @@ use std::vec::IntoIter;
 
 use app_units::Au;
 use fonts::FontMetrics;
+use malloc_size_of_derive::MallocSizeOf;
 
 use super::{InlineContainerState, InlineContainerStateFlags, inline_container_needs_strut};
 use crate::ContainingBlock;
@@ -17,7 +18,7 @@ use crate::fragment_tree::BaseFragmentInfo;
 use crate::layout_box_base::LayoutBoxBase;
 use crate::style_ext::{LayoutStyle, PaddingBorderMargin};
 
-#[derive(Debug)]
+#[derive(Debug, MallocSizeOf)]
 pub(crate) struct InlineBox {
     pub base: LayoutBoxBase,
     /// The identifier of this inline box in the containing [`super::InlineFormattingContext`].
@@ -56,7 +57,7 @@ impl InlineBox {
     }
 }
 
-#[derive(Debug, Default)]
+#[derive(Debug, Default, MallocSizeOf)]
 pub(crate) struct InlineBoxes {
     /// A collection of all inline boxes in a particular [`super::InlineFormattingContext`].
     inline_boxes: Vec<ArcRefCell<InlineBox>>,
@@ -162,7 +163,7 @@ impl InlineBoxes {
     }
 }
 
-#[derive(Clone, Copy, Debug, PartialEq)]
+#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq)]
 pub(super) enum InlineBoxTreePathToken {
     Start(InlineBoxIdentifier),
     End(InlineBoxIdentifier),
@@ -183,7 +184,7 @@ impl InlineBoxTreePathToken {
 /// [`u32`] is used for the index, in order to save space. The value refers to the token
 /// in the start tree data structure which can be fetched to find the actual index of
 /// of the [`InlineBox`] in [`InlineBoxes::inline_boxes`].
-#[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
+#[derive(Clone, Copy, Debug, Default, Eq, Hash, MallocSizeOf, PartialEq)]
 pub(crate) struct InlineBoxIdentifier {
     pub index_of_start_in_tree: u32,
     pub index_in_inline_boxes: u32,