Expose setSequentialFocusNavigationStartingPoint to accessibility.

third_party/WebKit/Source/modules/accessibility/AXObject.cpp

Index: third_party/WebKit/Source/modules/accessibility/AXObject.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXObject.cpp b/third_party/WebKit/Source/modules/accessibility/AXObject.cpp
index dd2017fded7c49e8942b151ffbe504aa0bd03041..9ef76f4da0e7db9d9e9c47f7892973edc0347f13 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXObject.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXObject.cpp
@@ -1566,6 +1566,13 @@ void AXObject::scrollToGlobalPoint(const IntPoint& globalPoint) const {
   }
 }
 
+void AXObject::setSequentialFocusNavigationStartingPoint() {
+  // Call it on the nearest ancestor that overrides this with a specific
+  // implementation.
+  if (parentObject())
+    parentObject()->setSequentialFocusNavigationStartingPoint();
+}
+
 void AXObject::notifyIfIgnoredValueChanged() {
   bool isIgnored = accessibilityIsIgnored();
   if (lastKnownIsIgnoredValue() != isIgnored) {