Cherry-pick 273869@main (5373d9e). https://bugs.webkit.org/show_bug.c…

…gi?id=268428

    Widget::root() should return a FrameView
    https://bugs.webkit.org/show_bug.cgi?id=268428
    rdar://121974586

    Reviewed by Alex Christensen.

    Widget::root() should return the top FrameView even if it is being hosted in another process.

    * Source/WebCore/platform/Widget.cpp:
    (WebCore::Widget::root const):
    * Source/WebCore/platform/Widget.h:

    Canonical link: https://commits.webkit.org/273869@main

Canonical link: https://commits.webkit.org/266719.360@webkitglib/2.42

Source/WebCore/platform/Widget.cpp

@@ -26,8 +26,8 @@
 #include "config.h"
 #include "Widget.h"
 
+#include "FrameView.h"
 #include "IntRect.h"
-#include "LocalFrameView.h"
 #include "NotImplemented.h"
 #include <wtf/Assertions.h>
 
@@ -55,13 +55,13 @@ void Widget::setParent(ScrollView* view)
         setParentVisible(true);
 }
 
-LocalFrameView* Widget::root() const
+FrameView* Widget::root() const
 {
     const Widget* top = this;
     while (top->parent())
         top = top->parent();
-    if (is<LocalFrameView>(*top))
-        return const_cast<LocalFrameView*>(downcast<LocalFrameView>(top));
+    if (auto* frameView = dynamicDowncast<FrameView>(top))
+        return const_cast<FrameView*>(frameView);
     return nullptr;
 }
 

Source/WebCore/platform/Widget.h

@@ -61,8 +61,8 @@ namespace WebCore {
 class Cursor;
 class Event;
 class FontCascade;
+class FrameView;
 class GraphicsContext;
-class LocalFrameView;
 class PlatformMouseEvent;
 class RegionContext;
 class ScrollView;
@@ -137,7 +137,7 @@ class Widget : public RefCounted<Widget>, public CanMakeWeakPtr<Widget> {
     WEBCORE_EXPORT void removeFromParent();
     WEBCORE_EXPORT virtual void setParent(ScrollView* view);
     WEBCORE_EXPORT ScrollView* parent() const;
-    LocalFrameView* root() const;
+    FrameView* root() const;
 
     virtual void handleEvent(Event&) { }