Cherry-pick eb5c280. rdar://121461105

    Add UIViewController to _WKWebExtensionAction.
    https://webkit.org/b/270099
    rdar://121461105

    Reviewed by Brian Weinstein.

    The logic for popups is complex on iOS, we should vend a UIViewController instead of just the WKWebView.
    This also overrides the viewport to accommodate desktop extenions better on mobile.

    * Source/WebKit/Platform/spi/ios/UIKitSPI.h:
    * Source/WebKit/UIProcess/API/Cocoa/_WKWebExtensionAction.h:
    * Source/WebKit/UIProcess/API/Cocoa/_WKWebExtensionAction.mm:
    (-[_WKWebExtensionAction popupViewController]):
    * Source/WebKit/UIProcess/Extensions/Cocoa/WebExtensionActionCocoa.mm:
    (-[_WKWebExtensionActionWebViewDelegate initWithWebExtensionAction:]):
    (-[_WKWebExtensionActionWebViewDelegate webView:decidePolicyForNavigationAction:decisionHandler:]):
    (-[_WKWebExtensionActionWebView initWithFrame:configuration:webExtensionAction:]):
    (-[_WKWebExtensionActionWebView dealloc]):
    (-[_WKWebExtensionActionWebView invalidateIntrinsicContentSize]):
    (-[_WKWebExtensionActionWebView observeValueForKeyPath:ofObject:change:context:]):
    (-[_WKWebExtensionActionWebView _contentSize]):
    (-[_WKWebExtensionActionWebView _contentSizeDidChange]):
    (-[_WKWebExtensionActionWebView _checkIfContentSizeStabilizedAndPresentPopup]):
    (-[_WKWebExtensionActionViewController initWithWebExtensionAction:]):
    (-[_WKWebExtensionActionViewController viewIsAppearing:]):
    (-[_WKWebExtensionActionViewController adaptivePresentationStyleForPresentationController:traitCollection:]):
    (-[_WKWebExtensionActionViewController presentationController:prepareAdaptivePresentationController:]):
    (-[_WKWebExtensionActionViewController presentationController:viewControllerForAdaptivePresentationStyle:]):
    (-[_WKWebExtensionActionViewController _viewControllerDismissalTransitionDidEnd:]):
    (-[_WKWebExtensionActionViewController _updatePopoverContentSize]):
    (-[_WKWebExtensionActionViewController _updateDetentForSheetPresentationController:]):
    (-[_WKWebExtensionActionViewController _dismissPopup]):
    (WebKit::WebExtensionAction::popupViewController):
    (WebKit::WebExtensionAction::popupWebView):
    (WebKit::WebExtensionAction::readyToPresentPopup):
    (WebKit::WebExtensionAction::popupSizeDidChange):
    (WebKit::WebExtensionAction::popupDidClose):
    (WebKit::WebExtensionAction::closePopupWebView):
    * Source/WebKit/UIProcess/Extensions/WebExtensionAction.h:
    * Tools/TestWebKitAPI/Tests/WebKitCocoa/WKWebExtensionAPIAction.mm:
    (TestWebKitAPI::TEST): Check that popupViewController is non-null.

    Canonical link: https://commits.webkit.org/275337@main

Source/WebKit/Platform/spi/ios/UIKitSPI.h

@@ -414,6 +414,7 @@ typedef struct CGSVGDocument *CGSVGDocumentRef;
 @class FBSDisplayConfiguration;
 @interface UIScreen ()
 @property (nonatomic, readonly, retain) FBSDisplayConfiguration *displayConfiguration;
+@property (nonatomic, readonly) CGRect _referenceBounds;
 @end
 
 @interface UIScrollView ()
@@ -545,6 +546,13 @@ typedef enum {
 @property (readonly) NSString *_hostApplicationBundleIdentifier;
 @end
 
+@interface UIViewController (Private)
+- (/* nullable */ UIPresentationController *)_existingPresentationControllerImmediate:(BOOL)immediate effective:(BOOL)effective;
+@end
+
+extern NSString * const UIPresentationControllerDismissalTransitionDidEndNotification;
+extern NSString * const UIPresentationControllerDismissalTransitionDidEndCompletedKey;
+
 @interface _UIViewControllerTransitionContext : NSObject <UIViewControllerContextTransitioning>
 @end
 

Source/WebKit/UIProcess/API/Cocoa/_WKWebExtensionAction.h

@@ -34,6 +34,7 @@
 #if TARGET_OS_IPHONE
 @class UIImage;
 @class UIMenuElement;
+@class UIViewController;
 #else
 @class NSImage;
 @class NSMenuItem;
@@ -126,11 +127,23 @@ NS_SWIFT_NAME(_WKWebExtension.Action)
  */
 @property (nonatomic, readonly) BOOL presentsPopup;
 
+#if TARGET_OS_IPHONE
+/*!
+ @abstract A view controller that presents a web view loaded with the popup page for this action, or `nil` if no popup is specified.
+ @discussion The view controller adaptively adjusts its presentation style based on where it is presented from, preferring popover.
+ It contains a web view preloaded with the popup page and automatically adjusts tis `preferredContentSize` to fit the web view's
+ content size. The `presentsPopup` property should be checked to determine the availability of a popup before accessing this property.
+ Dismissing the view controller will close the web view.
+ @seealso presentsPopup
+ */
+@property (nonatomic, readonly, nullable) UIViewController *popupViewController;
+#endif
+
 /*!
  @abstract A web view loaded with the popup page for this action, or `nil` if no popup is specified.
- @discussion The web view will be preloaded with the popup page upon first access or after it has been closed. Use the `hasPopup`
+ @discussion The web view will be preloaded with the popup page upon first access or after it has been closed. Use the `presentsPopup`
  property to determine whether a popup should be displayed before accessing this property.
- @seealso hasPopup
+ @seealso presentsPopup
  */
 @property (nonatomic, readonly, nullable) WKWebView *popupWebView;
 

Source/WebKit/UIProcess/API/Cocoa/_WKWebExtensionAction.mm

@@ -119,6 +119,13 @@ - (BOOL)presentsPopup
     return _webExtensionAction->presentsPopup();
 }
 
+#if PLATFORM(IOS_FAMILY)
+- (UIViewController *)popupViewController
+{
+    return _webExtensionAction->popupViewController();
+}
+#endif
+
 - (WKWebView *)popupWebView
 {
     return _webExtensionAction->popupWebView();
@@ -192,6 +199,13 @@ - (BOOL)presentsPopup
     return NO;
 }
 
+#if PLATFORM(IOS_FAMILY)
+- (UIViewController *)popupViewController
+{
+    return nil;
+}
+#endif
+
 - (WKWebView *)popupWebView
 {
     return nil;