webgpu: Sync `GPUBuffer` (#33154)

* More helpers on `Promise`

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

* Sync `GPUBuffer`

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

* Set some good expectations

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

* Some bad expect

also on firefox

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

* Extract DataBlock, DataView impl from GPUBuffer

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

* Fix size check to work on 32bit platforms

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

---------

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/components/script/dom/promise.rs b/components/script/dom/promise.rs
index 7c98ddbd2ad..38e5a9112ac 100644
--- a/components/script/dom/promise.rs
+++ b/components/script/dom/promise.rs
@@ -52,6 +52,12 @@ pub struct Promise {
     permanent_js_root: Heap<JSVal>,
 }
 
+impl PartialEq for Promise {
+    fn eq(&self, other: &Self) -> bool {
+        self.reflector == other.reflector
+    }
+}
+
 /// Private helper to enable adding new methods to `Rc<Promise>`.
 trait PromiseHelper {
     fn initialize(&self, cx: SafeJSContext);
@@ -232,6 +238,18 @@ impl Promise {
     }
 
     #[allow(unsafe_code)]
+    pub fn is_rejected(&self) -> bool {
+        let state = unsafe { GetPromiseState(self.promise_obj()) };
+        matches!(state, PromiseState::Rejected)
+    }
+
+    #[allow(unsafe_code)]
+    pub fn is_pending(&self) -> bool {
+        let state = unsafe { GetPromiseState(self.promise_obj()) };
+        matches!(state, PromiseState::Pending)
+    }
+
+    #[allow(unsafe_code)]
     pub fn promise_obj(&self) -> HandleObject {
         let obj = self.reflector().get_jsobject();
         unsafe {