Initialize Rust GPUI browser shell

crates/ely_servo_host/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "ely_servo_host"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+rust-version.workspace = true
+
+[dependencies]
+ely_domain = { path = "../ely_domain" }
+thiserror.workspace = true
+
+[lints]
+workspace = true

crates/ely_servo_host/src/error.rs

@@ -0,0 +1,11 @@
+use ely_domain::WebViewId;
+use thiserror::Error;
+
+#[derive(Clone, Debug, Error, Eq, PartialEq)]
+pub enum ServoHostError {
+    #[error("webview not found: {id}")]
+    WebViewNotFound { id: WebViewId },
+
+    #[error("permission request missing profile context")]
+    MissingProfileContext,
+}

crates/ely_servo_host/src/host.rs

@@ -0,0 +1,51 @@
+use ely_domain::{ProfileId, TabId, UrlText, WebViewId};
+
+use crate::ServoHostError;
+
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub enum WebViewState {
+    Created,
+    Attached,
+    Sleeping,
+    Crashed,
+}
+
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct NavigationRequest {
+    pub webview_id: WebViewId,
+    pub tab_id: TabId,
+    pub url: UrlText,
+}
+
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct PermissionRequest {
+    pub webview_id: WebViewId,
+    pub tab_id: TabId,
+    pub profile_id: ProfileId,
+    pub feature: String,
+}
+
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub enum PermissionDecision {
+    AllowOnce,
+    AllowAlways,
+    DenyAlways,
+}
+
+pub trait ServoHost {
+    fn create_webview(
+        &mut self,
+        tab_id: TabId,
+        profile_id: ProfileId,
+    ) -> Result<WebViewId, ServoHostError>;
+
+    fn navigate(&mut self, request: NavigationRequest) -> Result<(), ServoHostError>;
+
+    fn set_permission(
+        &mut self,
+        request: PermissionRequest,
+        decision: PermissionDecision,
+    ) -> Result<(), ServoHostError>;
+
+    fn state(&self, webview_id: &WebViewId) -> Result<WebViewState, ServoHostError>;
+}

crates/ely_servo_host/src/lib.rs

@@ -0,0 +1,5 @@
+mod error;
+mod host;
+
+pub use error::ServoHostError;
+pub use host::{NavigationRequest, PermissionDecision, PermissionRequest, ServoHost, WebViewState};