WIP: delegatesFocus

Source/core/page/FocusController.cpp

Index: Source/core/page/FocusController.cpp
diff --git a/Source/core/page/FocusController.cpp b/Source/core/page/FocusController.cpp
index 5263e8f4b73cab27619921a4bcb980d2d6cdee98..8ccd5e2e749b888e115749d8b3bd3343a4ab0edd 100644
--- a/Source/core/page/FocusController.cpp
+++ b/Source/core/page/FocusController.cpp
@@ -526,7 +526,7 @@ Node* FocusController::findFocusableNodeAcrossFocusScopesBackward(const FocusNav
         if (!owner)
             break;
         currentScope = FocusNavigationScope::focusNavigationScopeOf(*owner);
-        if (isKeyboardFocusableShadowHost(*owner) && toElement(owner)->tabStop()) {
+        if (isKeyboardFocusableShadowHost(*owner) && !toElement(owner)->shadowRoot()->delegatesFocus()) {
             found = owner;
             break;
         }
@@ -548,7 +548,8 @@ Node* FocusController::findFocusableNodeRecursivelyForward(const FocusNavigation
     Node* found = findFocusableNode(WebFocusTypeForward, scope, start);
     if (!found)
         return nullptr;
-    if (found->isElementNode() && !toElement(found)->tabStop()) {
+    // TODO(kochi): simplify this logic further.
+    if (found->isElementNode() && toElement(found)->shadowRoot() && toElement(found)->shadowRoot()->delegatesFocus()) {
         if (isShadowHostWithoutCustomFocusLogic(*found)) {
             FocusNavigationScope innerScope = FocusNavigationScope::ownedByShadowHost(*found);
             Node* foundInInnerFocusScope = findFocusableNodeRecursivelyForward(innerScope, nullptr);
@@ -584,7 +585,8 @@ Node* FocusController::findFocusableNodeRecursivelyBackward(const FocusNavigatio
         Node* foundInInnerFocusScope = findFocusableNodeRecursivelyBackward(innerScope, nullptr);
         if (foundInInnerFocusScope)
             return foundInInnerFocusScope;
-        if (found->isElementNode() && !toElement(found)->tabStop())
+        // TODO(kochi): Simplify this logic further.
+        if (found->isElementNode() && toElement(found)->shadowRoot() && toElement(found)->shadowRoot()->delegatesFocus())
             found = findFocusableNodeRecursivelyBackward(scope, found);
         return found;
     }
@@ -598,7 +600,7 @@ Node* FocusController::findFocusableNodeRecursivelyBackward(const FocusNavigatio
         return foundInInnerFocusScope ? foundInInnerFocusScope : findFocusableNodeRecursivelyBackward(scope, found);
     }
 
-    return found->isElementNode() && toElement(found)->tabStop() ? found : findFocusableNodeRecursivelyBackward(scope, found);
+    return found->isElementNode() && !(toElement(found)->shadowRoot() && toElement(found)->shadowRoot()->delegatesFocus()) ? found : findFocusableNodeRecursivelyBackward(scope, found);
 }
 
 static Node* findNodeWithExactTabIndex(Node* start, int tabIndex, WebFocusType type)