Activate flexbox layout tracing

components/layout/flex.rs

@@ -35,7 +35,7 @@ use style::values::computed::{LengthOrPercentageOrAutoOrContent, LengthOrPercent
 
 /// The size of an axis. May be a specified size, a min/max
 /// constraint, or an unlimited size
-#[derive(Debug)]
+#[derive(Debug, Serialize)]
 enum AxisSize {
     Definite(Au),
     MinMax(SizeConstraint),
@@ -102,7 +102,7 @@ fn from_flex_basis(flex_basis: LengthOrPercentageOrAutoOrContent,
 
 /// Represents a child in a flex container. Most fields here are used in
 /// flex size resolving, and items are sorted by the 'order' property.
-#[derive(Debug)]
+#[derive(Debug, Serialize)]
 struct FlexItem {
     /// Main size of a flex item, used to store results of flexible length calcuation.
     pub main_size: Au,
@@ -240,7 +240,7 @@ impl FlexItem {
 
 /// A line in a flex container.
 // TODO(stshine): More fields are required to handle collapsed items and baseline alignment.
-#[derive(Debug)]
+#[derive(Debug, Serialize)]
 struct FlexLine {
     /// Range of items belong to this line in 'self.items'.
     pub range: Range<usize>,
@@ -330,7 +330,7 @@ impl FlexLine {
 }
 
 /// A block with the CSS `display` property equal to `flex`.
-#[derive(Debug)]
+#[derive(Debug, Serialize)]
 pub struct FlexFlow {
     /// Data common to all block flows.
     block_flow: BlockFlow,
@@ -496,7 +496,7 @@ impl FlexFlow {
                                       inline_end_content_edge: Au,
                                       content_inline_size: Au) {
         let _scope = layout_debug_scope!("flex::block_mode_assign_inline_sizes");
-        debug!("block_mode_assign_inline_sizes");
+        debug!("flex::block_mode_assign_inline_sizes");
 
         // FIXME (mbrubeck): Get correct mode for absolute containing block
         let containing_block_mode = self.block_flow.base.writing_mode;

components/layout/flow_list.rs

@@ -30,15 +30,16 @@ impl Serialize for FlowList {
             let flow_val = ObjectBuilder::new()
                 .insert("class", f.class())
                 .insert("data", match f.class() {
-                    FlowClass::Block => to_value(f.as_block()),
-                    FlowClass::Inline => to_value(f.as_inline()),
-                    FlowClass::Table => to_value(f.as_table()),
-                    FlowClass::TableWrapper => to_value(f.as_table_wrapper()),
+                    FlowClass::Block         => to_value(f.as_block()),
+                    FlowClass::Inline        => to_value(f.as_inline()),
+                    FlowClass::Table         => to_value(f.as_table()),
+                    FlowClass::TableWrapper  => to_value(f.as_table_wrapper()),
                     FlowClass::TableRowGroup => to_value(f.as_table_rowgroup()),
-                    FlowClass::TableRow => to_value(f.as_table_row()),
-                    FlowClass::TableCell => to_value(f.as_table_cell()),
+                    FlowClass::TableRow      => to_value(f.as_table_row()),
+                    FlowClass::TableCell     => to_value(f.as_table_cell()),
+                    FlowClass::Flex          => to_value(f.as_flex()),
                     FlowClass::ListItem | FlowClass::TableColGroup | FlowClass::TableCaption |
-                    FlowClass::Multicol | FlowClass::MulticolColumn | FlowClass::Flex => {
+                    FlowClass::Multicol | FlowClass::MulticolColumn => {
                         Value::Null // Not implemented yet
                     }
                 })

components/layout/model.rs

@@ -523,7 +523,7 @@ impl ToGfxMatrix for ComputedMatrix {
 /// parameter, and when it is present the constraint will be subtracted. This is
 /// used to adjust the constraint for `box-sizing: border-box`, and when you do so
 /// make sure the size you want to clamp is intended to be used for content box.
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug, Serialize)]
 pub struct SizeConstraint {
     min_size: Au,
     max_size: Option<Au>,

components/style/logical_geometry.rs

@@ -215,6 +215,7 @@ impl Debug for DebugWritingMode {
 
 // Used to specify the logical direction.
 #[derive(Debug, Clone, Copy, PartialEq)]
+#[cfg_attr(feature = "servo", derive(Serialize))]
 pub enum Direction {
     Inline,
     Block