Remove most of the things in layout 2020

[nox]

We keep mostly the query system. There is probably more to delete but
that's a good start I think.

---

This change is 

[highfive]

Heads up! This PR modifies the following files:

• @emilio: components/layout/display_list/builder.rs

[highfive]

Warning

• These commits modify unsafe code. Please review it carefully!
• These commits modify layout code, but no tests are modified. Please consider adding a test!

[nox]

@bors-servo r=SimonSapin

[bors-servo]

📌 Commit e5e0ec5 has been approved by SimonSapin

[bors-servo]

⌛ Testing commit e5e0ec5 with merge ac6e0f9...

[bors-servo]

💔 Test failed - status-taskcluster

[CYBAI]

Needs ./mach fmt 👀

Diff in /repo/components/layout_2020/display_list/items.rs at line 6:
 use gfx_traits;
 use std::collections::HashMap;
 use std::f32;
�[31m-use webrender_api::ExternalScrollId;
�(B�[m use webrender_api::units::LayoutPixel;
�[32m+use webrender_api::ExternalScrollId;
�(B�[m 
 pub use style::dom::OpaqueNode;
 
Diff in /repo/components/layout_2020/display_list/webrender_helpers.rs at line 4:
 
 use crate::display_list::items::DisplayList;
 use msg::constellation_msg::PipelineId;
�[32m+use webrender_api::units::LayoutSize;
�(B�[m use webrender_api::{self, DisplayListBuilder};
�[31m-use webrender_api::units::{LayoutSize};
�(B�[m 
 pub trait WebRenderDisplayListConverter {
     fn convert_to_webrender(&mut self, pipeline_id: PipelineId) -> DisplayListBuilder;
Diff in /repo/components/layout_2020/query.rs at line 358:
     }
 }
 
�[31m-pub fn process_content_box_request(
�(B�[m�[31m-    requested_node: OpaqueNode,
�(B�[m�[31m-) -> Option<Rect<Au>> {
�(B�[m�[32m+pub fn process_content_box_request(requested_node: OpaqueNode) -> Option<Rect<Au>> {
�(B�[m     UnioningFragmentBorderBoxIterator::new(requested_node).rect
 }
 
Diff in /repo/components/layout_2020/query.rs at line 367:
�[31m-pub fn process_content_boxes_request(
�(B�[m�[31m-    requested_node: OpaqueNode,
�(B�[m�[31m-) -> Vec<Rect<Au>> {
�(B�[m�[32m+pub fn process_content_boxes_request(requested_node: OpaqueNode) -> Vec<Rect<Au>> {
�(B�[m     // FIXME(pcwalton): This has not been updated to handle the stacking context relative
     // stuff. So the position is wrong in most cases.
     CollectingFragmentBorderBoxIterator::new(requested_node).rects
Diff in /repo/components/layout_2020/query.rs at line 613:
     }
 }
 
�[31m-pub fn process_node_geometry_request(
�(B�[m�[31m-    requested_node: OpaqueNode,
�(B�[m�[31m-) -> Rect<i32> {
�(B�[m�[32m+pub fn process_node_geometry_request(requested_node: OpaqueNode) -> Rect<i32> {
�(B�[m     FragmentLocatingFragmentIterator::new(requested_node).client_rect
 }
 
Diff in /repo/components/layout_2020/query.rs at line 628:
 }
 
 /// https://drafts.csswg.org/cssom-view/#scrolling-area
�[31m-pub fn process_node_scroll_area_request(
�(B�[m�[31m-    requested_node: OpaqueNode,
�(B�[m�[31m-) -> Rect<i32> {
�(B�[m�[32m+pub fn process_node_scroll_area_request(requested_node: OpaqueNode) -> Rect<i32> {
�(B�[m     let iterator = UnioningFragmentScrollAreaIterator::new(requested_node);
     match iterator.overflow_direction {
         OverflowDirection::RightAndDown => {
Diff in /repo/components/layout_2020/query.rs at line 854:
     }
 }
 
�[31m-pub fn process_offset_parent_query(
�(B�[m�[31m-    requested_node: OpaqueNode,
�(B�[m�[31m-) -> OffsetParentResponse {
�(B�[m�[32m+pub fn process_offset_parent_query(requested_node: OpaqueNode) -> OffsetParentResponse {
�(B�[m     let iterator = ParentOffsetBorderBoxIterator::new(requested_node);
 
     let node_offset_box = iterator.node_offset_box;
Diff in /repo/components/layout_thread_2020/lib.rs at line 57:
 use msg::constellation_msg::{
     BackgroundHangMonitor, BackgroundHangMonitorRegister, HangAnnotation,
 };
�[31m-use msg::constellation_msg::{MonitoredComponentId, TopLevelBrowsingContextId};
�(B�[m use msg::constellation_msg::{LayoutHangAnnotation, MonitoredComponentType, PipelineId};
�[32m+use msg::constellation_msg::{MonitoredComponentId, TopLevelBrowsingContextId};
�(B�[m use net_traits::image_cache::ImageCache;
 use parking_lot::RwLock;
 use profile_traits::mem::{self as profile_mem, Report, ReportKind, ReportsChan};
Diff in /repo/components/layout_thread_2020/lib.rs at line 1372:
         }
 
         self.first_reflow.set(false);
�[31m-        self.respond_to_query_if_necessary(
�(B�[m�[31m-            &data.reflow_goal,
�(B�[m�[31m-            &mut *rw_data,
�(B�[m�[31m-            &mut layout_context,
�(B�[m�[31m-        );
�(B�[m�[32m+        self.respond_to_query_if_necessary(&data.reflow_goal, &mut *rw_data, &mut layout_context);
�(B�[m     }
 
     fn respond_to_query_if_necessary(
Diff in /repo/components/layout_thread_2020/lib.rs at line 1405:
                     rw_data.client_rect_response = process_node_geometry_request(node);
                 },
                 &QueryMsg::NodeScrollGeometryQuery(node) => {
�[31m-                    rw_data.scroll_area_response =
�(B�[m�[31m-                        process_node_scroll_area_request(node);
�(B�[m�[32m+                    rw_data.scroll_area_response = process_node_scroll_area_request(node);
�(B�[m                 },
                 &QueryMsg::NodeScrollIdQuery(node) => {
                     let node = unsafe { ServoLayoutNode::new(&node) };
Diff in /repo/components/layout_thread_2020/lib.rs at line 1435:
                     // particular pipeline, so we need to tell WebRender about that.
                     flags.insert(webrender_api::HitTestFlags::POINT_RELATIVE_TO_PIPELINE_VIEWPORT);
 
�[31m-                    let client_point =
�(B�[m�[31m-                        webrender_api::units::WorldPoint::from_untyped(client_point);
�(B�[m�[32m+                    let client_point = webrender_api::units::WorldPoint::from_untyped(client_point);
�(B�[m                     let results = self.webrender_api.hit_test(
                         self.webrender_document,
                         Some(self.id.to_webrender()),
Diff in /repo/components/layout_thread_2020/lib.rs at line 1534:
             || {},
         );
 
�[31m-        self.perform_post_main_layout_passes(
�(B�[m�[31m-            root_flow,
�(B�[m�[31m-            reflow_goal,
�(B�[m�[31m-            document,
�(B�[m�[31m-            rw_data,
�(B�[m�[31m-        );
�(B�[m�[32m+        self.perform_post_main_layout_passes(root_flow, reflow_goal, document, rw_data);
�(B�[m     }
 
     fn perform_post_main_layout_passes(
Run `./mach fmt` to fix the formatting

[nox]

@bors-servo r=SimonSapin

[bors-servo]

📌 Commit f8341da has been approved by SimonSapin

[bors-servo]

⌛ Testing commit f8341da with merge 196c511...

[bors-servo]

☀️ Test successful - linux-rel-css, linux-rel-wpt, status-taskcluster
Approved by: SimonSapin
Pushing 196c511 to master...