style: Add a ValueInfo trait for exposing types needed by devtools.

Most of types just derive it using proc_macro directly. Some of value
types need manual impl.

In my current plan, this new trait will be used in bug 1434130 to expose
values as well.

Bug: 1455576
Reviewed-by: emilio
MozReview-Commit-ID: LI7fy45VkRw

1 files changed, 6 insertions, 3 deletions

diff --git a/components/style/values/generics/counters.rs b/components/style/values/generics/counters.rs
index e47a120b1d5..037834abf6e 100644
--- a/components/style/values/generics/counters.rs
+++ b/components/style/values/generics/counters.rs
@@ -11,7 +11,8 @@ use style_traits::{CssWriter, ToCss};
 use values::CustomIdent;
 
 /// A generic value for the `counter-increment` property.
-#[derive(Clone, Debug, Default, MallocSizeOf, PartialEq, ToComputedValue, ToCss)]
+#[derive(Clone, Debug, Default, MallocSizeOf, PartialEq, SpecifiedValueInfo,
+         ToComputedValue, ToCss)]
 pub struct CounterIncrement<I>(Counters<I>);
 
 impl<I> CounterIncrement<I> {
@@ -32,7 +33,8 @@ impl<I> Deref for CounterIncrement<I> {
 }
 
 /// A generic value for the `counter-reset` property.
-#[derive(Clone, Debug, Default, MallocSizeOf, PartialEq, ToComputedValue, ToCss)]
+#[derive(Clone, Debug, Default, MallocSizeOf, PartialEq, SpecifiedValueInfo,
+         ToComputedValue, ToCss)]
 pub struct CounterReset<I>(Counters<I>);
 
 impl<I> CounterReset<I> {
@@ -55,7 +57,8 @@ impl<I> Deref for CounterReset<I> {
 /// A generic value for lists of counters.
 ///
 /// Keyword `none` is represented by an empty vector.
-#[derive(Clone, Debug, MallocSizeOf, PartialEq, ToComputedValue)]
+#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo,
+         ToComputedValue)]
 pub struct Counters<I>(Box<[(CustomIdent, I)]>);
 
 impl<I> Default for Counters<I> {