Merge "ExternalPopupMenu should recreate its popup only if a SELECT subtree is updated" to M51

third_party/WebKit/Source/platform/PopupMenu.h

Index: third_party/WebKit/Source/platform/PopupMenu.h
diff --git a/third_party/WebKit/Source/platform/PopupMenu.h b/third_party/WebKit/Source/platform/PopupMenu.h
index 98a4757de10b137e5091ce52439be206edbba799..41c8f4d003c57089e82b8ff07d63453cbe4e78f7 100644
--- a/third_party/WebKit/Source/platform/PopupMenu.h
+++ b/third_party/WebKit/Source/platform/PopupMenu.h
@@ -33,7 +33,12 @@ public:
     DEFINE_INLINE_VIRTUAL_TRACE() { }
     virtual void show() = 0;
     virtual void hide() = 0;
-    virtual void updateFromElement() = 0;
+    enum UpdateReason {
+        BySelectionChange,
+        ByStyleChange,
+        ByDOMChange,
+    };
+    virtual void updateFromElement(UpdateReason) = 0;
     virtual void disconnectClient() = 0;
 };