Move non-gfx things out of `gfx_traits` and create a `base` crate (#32296)

For a long time, `gfx_traits` has held a lot of things unrelated to graphics
and also unrelated to the `gfx` crate (which is mostly about fonts).
This is a cleanup which does a few things:

1. Move non `gfx` crate things out of `gfx_traits`. This is important in
   order to prevent dependency cycles with a different integration between
   layout, script, and fonts.
2. Rename the `msg` crate to `base`. It didn't really contain anything
   to do with messages and instead mostly holds ids, which are used
   across many different crates in Servo. This new crate will hold the
   *rare* data types that are widely used.

Details:

 - All BackgroundHangMonitor-related things from base to a new
   `background_hang_monitor_api` crate.
 - Moved `TraversalDirection` to `script_traits`
 - Moved `Epoch`-related things from `gfx_traits` to `base`.
 - Moved `PrintTree` to base. This should be widely useful in Servo.
 - Moved `WebrenderApi` from `base` to `webrender_traits` and renamed it
   to `WebRenderFontApi`.

13 files changed, 13 insertions, 13 deletions

diff --git a/components/script/task_source/dom_manipulation.rs b/components/script/task_source/dom_manipulation.rs
index eaff254a5cf..1469db66155 100644
--- a/components/script/task_source/dom_manipulation.rs
+++ b/components/script/task_source/dom_manipulation.rs
@@ -5,7 +5,7 @@
 use std::fmt;
 use std::result::Result;
 
-use msg::constellation_msg::PipelineId;
+use base::id::PipelineId;
 use servo_atoms::Atom;
 
 use crate::dom::bindings::inheritance::Castable;
diff --git a/components/script/task_source/file_reading.rs b/components/script/task_source/file_reading.rs
index 77e566dbf63..afb1f5c104a 100644
--- a/components/script/task_source/file_reading.rs
+++ b/components/script/task_source/file_reading.rs
@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use msg::constellation_msg::PipelineId;
+use base::id::PipelineId;
 
 use crate::dom::domexception::DOMErrorName;
 use crate::dom::filereader::{FileReader, GenerationId, ReadMetaData, TrustedFileReader};
diff --git a/components/script/task_source/gamepad.rs b/components/script/task_source/gamepad.rs
index e6694f3daea..9d38257bace 100644
--- a/components/script/task_source/gamepad.rs
+++ b/components/script/task_source/gamepad.rs
@@ -5,7 +5,7 @@
 use std::fmt;
 use std::result::Result;
 
-use msg::constellation_msg::PipelineId;
+use base::id::PipelineId;
 
 use crate::script_runtime::{CommonScriptMsg, ScriptChan, ScriptThreadEventCategory};
 use crate::task::{TaskCanceller, TaskOnce};
diff --git a/components/script/task_source/history_traversal.rs b/components/script/task_source/history_traversal.rs
index 1676461fa99..4bb90a1ffcb 100644
--- a/components/script/task_source/history_traversal.rs
+++ b/components/script/task_source/history_traversal.rs
@@ -2,8 +2,8 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+use base::id::PipelineId;
 use crossbeam_channel::Sender;
-use msg::constellation_msg::PipelineId;
 
 use crate::script_runtime::{CommonScriptMsg, ScriptThreadEventCategory};
 use crate::script_thread::MainThreadScriptMsg;
diff --git a/components/script/task_source/media_element.rs b/components/script/task_source/media_element.rs
index 64d2f6c2764..944ffc4f5bf 100644
--- a/components/script/task_source/media_element.rs
+++ b/components/script/task_source/media_element.rs
@@ -5,8 +5,8 @@
 use std::fmt;
 use std::result::Result;
 
+use base::id::PipelineId;
 use crossbeam_channel::Sender;
-use msg::constellation_msg::PipelineId;
 use servo_atoms::Atom;
 
 use crate::dom::bindings::inheritance::Castable;
diff --git a/components/script/task_source/networking.rs b/components/script/task_source/networking.rs
index b55331af526..f142c1f6ae0 100644
--- a/components/script/task_source/networking.rs
+++ b/components/script/task_source/networking.rs
@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use msg::constellation_msg::PipelineId;
+use base::id::PipelineId;
 
 use crate::script_runtime::{CommonScriptMsg, ScriptChan, ScriptThreadEventCategory};
 use crate::task::{TaskCanceller, TaskOnce};
diff --git a/components/script/task_source/performance_timeline.rs b/components/script/task_source/performance_timeline.rs
index 9f6f56a2cf4..9bcfe4bc1d8 100644
--- a/components/script/task_source/performance_timeline.rs
+++ b/components/script/task_source/performance_timeline.rs
@@ -9,7 +9,7 @@
 use std::fmt;
 use std::result::Result;
 
-use msg::constellation_msg::PipelineId;
+use base::id::PipelineId;
 
 use crate::dom::bindings::refcounted::Trusted;
 use crate::dom::globalscope::GlobalScope;
diff --git a/components/script/task_source/port_message.rs b/components/script/task_source/port_message.rs
index b9bca1e6194..0ca613c647c 100644
--- a/components/script/task_source/port_message.rs
+++ b/components/script/task_source/port_message.rs
@@ -4,7 +4,7 @@
 
 use std::fmt;
 
-use msg::constellation_msg::PipelineId;
+use base::id::PipelineId;
 
 use crate::script_runtime::{CommonScriptMsg, ScriptChan, ScriptThreadEventCategory};
 use crate::task::{TaskCanceller, TaskOnce};
diff --git a/components/script/task_source/remote_event.rs b/components/script/task_source/remote_event.rs
index cadba9b3016..9a70d2a0234 100644
--- a/components/script/task_source/remote_event.rs
+++ b/components/script/task_source/remote_event.rs
@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use msg::constellation_msg::PipelineId;
+use base::id::PipelineId;
 
 use crate::script_runtime::{CommonScriptMsg, ScriptChan, ScriptThreadEventCategory};
 use crate::task::{TaskCanceller, TaskOnce};
diff --git a/components/script/task_source/rendering.rs b/components/script/task_source/rendering.rs
index 732eb2aef2b..43afa4abb68 100644
--- a/components/script/task_source/rendering.rs
+++ b/components/script/task_source/rendering.rs
@@ -5,7 +5,7 @@
 use std::fmt;
 use std::result::Result;
 
-use msg::constellation_msg::PipelineId;
+use base::id::PipelineId;
 
 use crate::script_runtime::{CommonScriptMsg, ScriptChan, ScriptThreadEventCategory};
 use crate::task::{TaskCanceller, TaskOnce};
diff --git a/components/script/task_source/timer.rs b/components/script/task_source/timer.rs
index e565a3aaa22..4f8ad10d811 100644
--- a/components/script/task_source/timer.rs
+++ b/components/script/task_source/timer.rs
@@ -4,7 +4,7 @@
 
 use std::fmt;
 
-use msg::constellation_msg::PipelineId;
+use base::id::PipelineId;
 
 use crate::script_runtime::{CommonScriptMsg, ScriptChan, ScriptThreadEventCategory};
 use crate::task::{TaskCanceller, TaskOnce};
diff --git a/components/script/task_source/user_interaction.rs b/components/script/task_source/user_interaction.rs
index a16277f2781..9ddc06d9185 100644
--- a/components/script/task_source/user_interaction.rs
+++ b/components/script/task_source/user_interaction.rs
@@ -5,8 +5,8 @@
 use std::fmt;
 use std::result::Result;
 
+use base::id::PipelineId;
 use crossbeam_channel::Sender;
-use msg::constellation_msg::PipelineId;
 use servo_atoms::Atom;
 
 use crate::dom::bindings::inheritance::Castable;
diff --git a/components/script/task_source/websocket.rs b/components/script/task_source/websocket.rs
index 27ad5202373..2d05067e28b 100644
--- a/components/script/task_source/websocket.rs
+++ b/components/script/task_source/websocket.rs
@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use msg::constellation_msg::PipelineId;
+use base::id::PipelineId;
 
 use crate::script_runtime::{CommonScriptMsg, ScriptChan, ScriptThreadEventCategory};
 use crate::task::{TaskCanceller, TaskOnce};