Always hold current frame

Regardless if it contains raw data or a gl texture.

It is required to hold current frame because it can be used for
webgl's get_image_pixels

components/script/dom/htmlmediaelement.rs

@@ -193,12 +193,12 @@ impl FrameRenderer for MediaFrameRenderer {
                         ImageData::Raw(frame.get_data()),
                         &webrender_api::DirtyRect::All,
                     );
-                } else if self.player_id.is_some() {
-                    self.current_frame_holder
-                        .get_or_insert_with(|| FrameHolder::new(frame.clone()))
-                        .set(frame);
                 }
 
+                self.current_frame_holder
+                    .get_or_insert_with(|| FrameHolder::new(frame.clone()))
+                    .set(frame);
+
                 if let Some(old_image_key) = self.old_frame.take() {
                     txn.delete_image(old_image_key);
                 }
@@ -220,9 +220,6 @@ impl FrameRenderer for MediaFrameRenderer {
                         TextureTarget::Default
                     };
 
-                    self.current_frame_holder
-                        .get_or_insert_with(|| FrameHolder::new(frame.clone()))
-                        .set(frame);
                     ImageData::External(ExternalImageData {
                         id: ExternalImageId(self.player_id.unwrap()),
                         channel_index: 0,
@@ -231,6 +228,11 @@ impl FrameRenderer for MediaFrameRenderer {
                 } else {
                     ImageData::Raw(frame.get_data())
                 };
+
+                self.current_frame_holder
+                    .get_or_insert_with(|| FrameHolder::new(frame.clone()))
+                    .set(frame);
+
                 txn.add_image(new_image_key, descriptor, image_data, None);
             },
             None => {
@@ -244,7 +246,6 @@ impl FrameRenderer for MediaFrameRenderer {
                         TextureTarget::Default
                     };
 
-                    self.current_frame_holder = Some(FrameHolder::new(frame));
                     ImageData::External(ExternalImageData {
                         id: ExternalImageId(self.player_id.unwrap()),
                         channel_index: 0,
@@ -253,6 +254,9 @@ impl FrameRenderer for MediaFrameRenderer {
                 } else {
                     ImageData::Raw(frame.get_data())
                 };
+
+                self.current_frame_holder = Some(FrameHolder::new(frame));
+
                 txn.add_image(image_key, descriptor, image_data, None);
             },
         }