libservo: Move WebDriver messages to the `embedder` crate (#35602)

This is the first step toward moving the WebDriver implementation to
servoshell. This move will make it possible to start testing the
embedding API with WebDriver. See [this zulip thread][a] for more details.

While WebDriver will be able to use a lot of API commands to do what it
is doing now, there will still need to be some "cheat codes" for more
gnarly access to `ScriptThread` details. That's why we likely won't be
able to remove all WebDriver-specific messages from the API -- but maybe
they will be useful for embedders somehow.

A couple messages have to change as they depended on `script_traits`
types, particularly those that used `WindowSizeData` and `LoadData`. I
think this helps to encapsulate the WebDriver commands a bit more
though.

[a]: https://servo.zulipchat.com/#narrow/channel/437943-embedding/topic/webdriver.20as.20embedding.20api.20playgound

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/components/script/script_thread.rs b/components/script/script_thread.rs
index 34b212ed9fb..e0998db7b2b 100644
--- a/components/script/script_thread.rs
+++ b/components/script/script_thread.rs
@@ -45,7 +45,9 @@ use devtools_traits::{
     CSSError, DevtoolScriptControlMsg, DevtoolsPageInfo, NavigationState,
     ScriptToDevtoolsControlMsg, WorkerId,
 };
-use embedder_traits::{EmbedderMsg, InputEvent, MediaSessionActionType, Theme};
+use embedder_traits::{
+    EmbedderMsg, InputEvent, MediaSessionActionType, Theme, WebDriverScriptCommand,
+};
 use euclid::default::Rect;
 use fonts::{FontContext, SystemFontServiceProxy};
 use headers::{HeaderMapExt, LastModified, ReferrerPolicy as ReferrerPolicyHeader};
@@ -77,7 +79,6 @@ use profile_traits::time_profile;
 use script_layout_interface::{
     node_id_from_scroll_id, LayoutConfig, LayoutFactory, ReflowGoal, ScriptThreadFactory,
 };
-use script_traits::webdriver_msg::WebDriverScriptCommand;
 use script_traits::{
     ConstellationInputEvent, DiscardBrowsingContext, DocumentActivity, EventResult,
     InitialScriptState, JsEvalResult, LoadData, LoadOrigin, NavigationHistoryBehavior,