[iOS] iPhone fullscreen captions are sometimes duplicated

https://bugs.webkit.org/show_bug.cgi?id=241464
rdar://94261522

Reviewed by Jer Noble.

Clear the text track representation when the video layer is cleared.

* Source/WebCore/platform/graphics/avfoundation/objc/VideoLayerManagerObjC.mm:
(WebCore::VideoLayerManagerObjC::didDestroyVideoLayer): Clear the text track representation.

* Source/WebCore/platform/graphics/cocoa/TextTrackRepresentationCocoa.mm:
(WebCore::TextTrackRepresentationCocoa::TextTrackRepresentationCocoa): Name the text
track representation layer to aid debugging in the future.

Canonical link: https://commits.webkit.org/251445@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@295439 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebCore/platform/graphics/avfoundation/objc/VideoLayerManagerObjC.mm

@@ -91,6 +91,9 @@
 {
     ALWAYS_LOG(LOGIDENTIFIER);
 
+#if ENABLE(VIDEO_PRESENTATION_MODE)
+    setTextTrackRepresentationLayer(nil);
+#endif
     [m_videoLayer removeFromSuperlayer];
 
     m_videoInlineLayer = nil;

Source/WebCore/platform/graphics/cocoa/TextTrackRepresentationCocoa.mm

@@ -119,6 +119,8 @@ - (id)actionForLayer:(CALayer *)layer forKey:(NSString *)event
 {
     [m_layer setDelegate:m_delegate.get()];
     [m_layer setContentsGravity:kCAGravityBottom];
+
+    [m_layer setName:@"TextTrackRepresentation"];
 }
 
 TextTrackRepresentationCocoa::~TextTrackRepresentationCocoa()