Add Servo engine host runtime

crates/ely_servo_host/src/host.rs

@@ -5,11 +5,73 @@ use crate::ServoHostError;
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub enum WebViewState {
     Created,
-    Attached,
+    Loading,
+    Complete,
     Sleeping,
     Crashed,
 }
 
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct WebViewSnapshot {
+    webview_id: WebViewId,
+    tab_id: TabId,
+    profile_id: ProfileId,
+    state: WebViewState,
+    url: Option<String>,
+    title: Option<String>,
+    has_pending_frame: bool,
+}
+
+impl WebViewSnapshot {
+    #[must_use]
+    pub fn new(
+        webview_id: WebViewId,
+        tab_id: TabId,
+        profile_id: ProfileId,
+        state: WebViewState,
+        url: Option<String>,
+        title: Option<String>,
+        has_pending_frame: bool,
+    ) -> Self {
+        Self { webview_id, tab_id, profile_id, state, url, title, has_pending_frame }
+    }
+
+    #[must_use]
+    pub fn webview_id(&self) -> &WebViewId {
+        &self.webview_id
+    }
+
+    #[must_use]
+    pub fn tab_id(&self) -> &TabId {
+        &self.tab_id
+    }
+
+    #[must_use]
+    pub fn profile_id(&self) -> &ProfileId {
+        &self.profile_id
+    }
+
+    #[must_use]
+    pub fn state(&self) -> &WebViewState {
+        &self.state
+    }
+
+    #[must_use]
+    pub fn url(&self) -> Option<&str> {
+        self.url.as_deref()
+    }
+
+    #[must_use]
+    pub fn title(&self) -> Option<&str> {
+        self.title.as_deref()
+    }
+
+    #[must_use]
+    pub fn has_pending_frame(&self) -> bool {
+        self.has_pending_frame
+    }
+}
+
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct NavigationRequest {
     pub webview_id: WebViewId,
@@ -48,4 +110,10 @@ pub trait ServoHost {
     ) -> Result<(), ServoHostError>;
 
     fn state(&self, webview_id: &WebViewId) -> Result<WebViewState, ServoHostError>;
+
+    fn snapshot(&self, webview_id: &WebViewId) -> Result<WebViewSnapshot, ServoHostError>;
+
+    fn tick(&mut self) -> bool;
+
+    fn paint(&mut self, webview_id: &WebViewId) -> Result<(), ServoHostError>;
 }