Rename Event.scoped to Event.composed and invert its meaning

third_party/WebKit/Source/core/events/EventPath.cpp

Index: third_party/WebKit/Source/core/events/EventPath.cpp
diff --git a/third_party/WebKit/Source/core/events/EventPath.cpp b/third_party/WebKit/Source/core/events/EventPath.cpp
index 899b677f6eecfbe5538b82c2000b609972c29ba0..feb2f0976cd1f1e997177f04c0de2e9a5521e01b 100644
--- a/third_party/WebKit/Source/core/events/EventPath.cpp
+++ b/third_party/WebKit/Source/core/events/EventPath.cpp
@@ -50,12 +50,13 @@ EventTarget* EventPath::eventTargetRespectingTargetRules(Node& referenceNode)
 
 static inline bool shouldStopAtShadowRoot(Event& event, ShadowRoot& shadowRoot, EventTarget& target)
 {
-    // WebKit never allowed selectstart event to cross the the shadow DOM boundary.
-    // Changing this breaks existing sites.
-    // See https://bugs.webkit.org/show_bug.cgi?id=52195 for details.
-    const AtomicString eventType = event.type();
-    return target.toNode() && target.toNode()->shadowHost() == shadowRoot.host()
-        && event.scoped();
+    if (shadowRoot.isV1()) {
+        // In v1, an event is scoped by default unless event.composed flag is set.
+        return !event.composed() && target.toNode() && target.toNode()->shadowHost() == shadowRoot.host();
+    }
+    // Ignores event.composed() for v0.
+    // Instead, use event.isScopedInV0() for backward compatibility.
+    return event.isScopedInV0() && target.toNode() && target.toNode()->shadowHost() == shadowRoot.host();
 }
 
 EventPath::EventPath(Node& node, Event* event)