expose egl display in gles

wgpu-hal/src/gles/egl.rs

@@ -1,5 +1,5 @@
 use glow::HasContext;
-use parking_lot::{Mutex, MutexGuard};
+use parking_lot::{MappedMutexGuard, Mutex, MutexGuard};
 use raw_window_handle::{HasRawWindowHandle, RawWindowHandle};
 
 use std::{ffi, os::raw, ptr, sync::Arc, time::Duration};
@@ -580,6 +580,25 @@ pub struct Instance {
     inner: Mutex<Inner>,
 }
 
+impl Instance {
+    pub fn raw_display(&self) -> MappedMutexGuard<'_, egl::Display> {
+        MutexGuard::map(
+            self.inner
+                .try_lock()
+                .expect("Could not lock instance. This is most-likely a deadlock."),
+            |inner| &mut inner.egl.display,
+        )
+    }
+
+    /// Returns the version of the EGL display.
+    pub fn egl_version(&self) -> (i32, i32) {
+        self.inner
+            .try_lock()
+            .expect("Could not lock instance. This is most-likely a deadlock.")
+            .version
+    }
+}
+
 unsafe impl Send for Instance {}
 unsafe impl Sync for Instance {}