Include WebViewId into EmbedderMsg variants where possible (#35211)

`EmbedderMsg` was previously paired with an implicit
`Option<WebViewId>`, even though almost all variants were either always
`Some` or always `None`, depending on whether there was a `WebView
involved.

This patch adds the `WebViewId` to as many `EmbedderMsg` variants as
possible, so we can call their associated `WebView` delegate methods
without needing to check and unwrap the `Option`. In many cases, this
required more changes to plumb through the `WebViewId`.

Notably, all `Request`s now explicitly need a `WebView` or not, in order
to ensure that it is passed when appropriate.

Signed-off-by: Delan Azabani <dazabani@igalia.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>

components/shared/bluetooth/Cargo.toml

@@ -12,6 +12,7 @@ name = "bluetooth_traits"
 path = "lib.rs"
 
 [dependencies]
+base = { workspace = true }
 embedder_traits = { workspace = true }
 ipc-channel = { workspace = true }
 regex = { workspace = true }

components/shared/bluetooth/scanfilter.rs

@@ -5,6 +5,7 @@
 use std::collections::{HashMap, HashSet};
 use std::slice::Iter;
 
+use base::id::WebViewId;
 use serde::{Deserialize, Serialize};
 
 // A device name can never be longer than 29 bytes. An adv packet is at most
@@ -114,21 +115,28 @@ impl BluetoothScanfilterSequence {
 
 #[derive(Debug, Deserialize, Serialize)]
 pub struct RequestDeviceoptions {
+    webview_id: WebViewId,
     filters: BluetoothScanfilterSequence,
     optional_services: ServiceUUIDSequence,
 }
 
 impl RequestDeviceoptions {
     pub fn new(
+        webview_id: WebViewId,
         filters: BluetoothScanfilterSequence,
         services: ServiceUUIDSequence,
     ) -> RequestDeviceoptions {
         RequestDeviceoptions {
+            webview_id,
             filters,
             optional_services: services,
         }
     }
 
+    pub fn webview_id(&self) -> WebViewId {
+        self.webview_id
+    }
+
     pub fn get_filters(&self) -> &BluetoothScanfilterSequence {
         &self.filters
     }