Upstream visionOS-specific AVKit usage

https://bugs.webkit.org/show_bug.cgi?id=258371
rdar://111125631

Reviewed by Tim Horton.

* Source/WebCore/PAL/pal/spi/cocoa/AVKitSPI.h:
* Source/WebCore/platform/ios/VideoFullscreenInterfaceAVKit.mm:
(-[WebAVPlayerViewController initWithFullscreenInterface:]):

Canonical link: https://commits.webkit.org/265384@main

Source/WebCore/PAL/pal/spi/cocoa/AVKitSPI.h

@@ -401,3 +401,17 @@ NS_ASSUME_NONNULL_END
 
 #endif // HAVE(PIP_CONTROLLER)
 
+#if PLATFORM(VISION)
+
+// FIXME: rdar://111125392 – import SPI using a header, following rdar://111123290.
+
+typedef NS_OPTIONS(NSUInteger, AVPlayerViewControllerFullScreenBehaviors) {
+    AVPlayerViewControllerFullScreenBehaviorHostContentInline = 1 << 3,
+};
+
+@interface AVPlayerViewController ()
+@property (nonatomic) BOOL prefersRoomDimming;
+@property (nonatomic) AVPlayerViewControllerFullScreenBehaviors fullScreenBehaviors;
+@end
+
+#endif // PLATFORM(VISION)

Source/WebCore/platform/ios/VideoFullscreenInterfaceAVKit.mm

@@ -52,10 +52,6 @@
 #import <AVKit/AVPictureInPictureController.h>
 #endif
 
-#if PLATFORM(VISION)
-#import <WebKitAdditions/VideoFullscreenInterfaceAVKitAdditions.h>
-#endif
-
 using namespace WebCore;
 
 #import <pal/cf/CoreMediaSoftLink.h>
@@ -408,8 +404,9 @@ - (instancetype)initWithFullscreenInterface:(VideoFullscreenInterfaceAVKit *)int
     _avPlayerViewController.get().delegate = self;
 #endif
 
-#if ENABLE(FULLSCREEN_WINDOW_EFFECTS)
-    setupAVPlayerViewControllerForFullscreenWindowEffects(_avPlayerViewController.get());
+#if PLATFORM(VISION)
+    [_avPlayerViewController setPrefersRoomDimming:NO];
+    [_avPlayerViewController setFullScreenBehaviors:AVPlayerViewControllerFullScreenBehaviorHostContentInline];
 #endif
 
 #if HAVE(PIP_CONTROLLER)