Derive Debug on FontGroup and its components

components/gfx/platform/freetype/font.rs

@@ -45,6 +45,7 @@ impl FontTableMethods for FontTable {
     }
 }
 
+#[derive(Debug)]
 pub struct FontHandle {
     // The font binary. This must stay valid for the lifetime of the font,
     // if the font is created using FT_Memory_Face.

components/gfx/platform/freetype/font_context.rs

@@ -70,7 +70,7 @@ pub type UserPtr = *mut User;
 
 // WARNING: We need to be careful how we use this struct. See the comment about Rc<> in
 // FontContextHandle.
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct FreeTypeLibraryHandle {
     pub ctx: FT_Library,
     mem: FT_Memory,
@@ -98,7 +98,7 @@ impl HeapSizeOf for FreeTypeLibraryHandle {
     }
 }
 
-#[derive(Clone, HeapSizeOf)]
+#[derive(Clone, HeapSizeOf, Debug)]
 pub struct FontContextHandle {
     // WARNING: FreeTypeLibraryHandle contains raw pointers, is clonable, and also implements
     // `Drop`. This field needs to be Rc<> to make sure that the `drop` function is only called

components/gfx/platform/freetype/font_template.rs

@@ -10,7 +10,7 @@ use string_cache::Atom;
 /// The identifier is an absolute path, and the bytes
 /// field is the loaded data that can be passed to
 /// freetype and azure directly.
-#[derive(Deserialize, Serialize)]
+#[derive(Deserialize, Serialize, Debug)]
 pub struct FontTemplateData {
     pub bytes: Vec<u8>,
     pub identifier: Atom,

components/gfx/platform/macos/font.rs

@@ -57,6 +57,7 @@ impl FontTableMethods for FontTable {
     }
 }
 
+#[derive(Debug)]
 pub struct FontHandle {
     pub font_data: Arc<FontTemplateData>,
     pub ctfont: CTFont,

components/gfx/platform/macos/font_context.rs

@@ -4,7 +4,7 @@
 
 use util::mem::HeapSizeOf;
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct FontContextHandle {
     ctx: ()
 }

components/gfx/platform/macos/font_template.rs

@@ -17,7 +17,7 @@ use string_cache::Atom;
 /// The identifier is a PostScript font name. The
 /// CTFont object is cached here for use by the
 /// paint functions that create CGFont references.
-#[derive(Deserialize, Serialize)]
+#[derive(Deserialize, Serialize, Debug)]
 pub struct FontTemplateData {
     /// The `CTFont` object, if present. This is cached here so that we don't have to keep creating
     /// `CTFont` instances over and over. It can always be recreated from the `identifier` and/or
@@ -64,6 +64,7 @@ impl FontTemplateData {
     }
 }
 
+#[derive(Debug)]
 pub struct CachedCTFont(Mutex<Option<CTFont>>);
 
 impl Deref for CachedCTFont {