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libservo: Allow embedders to execute JavaScript scripts via the API (#35720)

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This change adds a new `WebView` API `evaluate_javascript()`, which
allows embedders to
execute JavaScript code and wait for a reply asynchronously. Ongoing
script execution is
tracked by a libservo `JavaScriptEvaluator` struct, which maps an id to
the callback passed
to the `evaluate_javascript()` method. The id is used to track the
script and its execution
through the other parts of Servo.

Testing: This changes includes `WebView` unit tests.

---------

Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>
Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Narfinger 2025-05-13 14:54:18 +02:00 • committed by GitHub
parent 91c4c7b998
commit 991be359a3
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12 changed files with 391 additions and 18 deletions
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7
components/shared/constellation/lib.rs
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@ -19,8 +19,8 @@ use base::Epoch;
use base::cross_process_instant::CrossProcessInstant;
use base::id::{MessagePortId, PipelineId, WebViewId};
use embedder_traits::{
CompositorHitTestResult, Cursor, InputEvent, MediaSessionActionType, Theme, ViewportDetails,
WebDriverCommandMsg,
CompositorHitTestResult, Cursor, InputEvent, JavaScriptEvaluationId, MediaSessionActionType,
Theme, ViewportDetails, WebDriverCommandMsg,
};
use euclid::Vector2D;
pub use from_script_message::*;
@ -92,6 +92,9 @@ pub enum EmbedderToConstellationMessage {
SetScrollStates(PipelineId, Vec<ScrollState>),
/// Notify the constellation that a particular paint metric event has happened for the given pipeline.
PaintMetric(PipelineId, PaintMetricEvent),
/// Evaluate a JavaScript string in the context of a `WebView`. When execution is complete or an
/// error is encountered, a correpsonding message will be sent to the embedding layer.
EvaluateJavaScript(WebViewId, JavaScriptEvaluationId, String),
}
/// A description of a paint metric that is sent from the Servo renderer to the