Keep formatting tags included when it is cut or copied.

third_party/WebKit/Source/core/editing/EditingUtilities.cpp

Index: third_party/WebKit/Source/core/editing/EditingUtilities.cpp
diff --git a/third_party/WebKit/Source/core/editing/EditingUtilities.cpp b/third_party/WebKit/Source/core/editing/EditingUtilities.cpp
index 05f2fd05176e0a57cb3f34e098282a250d1f0965..0b872ea695c070058c0f0ec7f83d36fc39d4159a 100644
--- a/third_party/WebKit/Source/core/editing/EditingUtilities.cpp
+++ b/third_party/WebKit/Source/core/editing/EditingUtilities.cpp
@@ -1136,6 +1136,16 @@ bool isListItem(const Node* n)
     return n && n->layoutObject() && n->layoutObject()->isListItem();
 }
 
+bool isPresentationalHTMLElement(const Node* node)
+{
+    if (!node->isHTMLElement())
+        return false;
+
+    const HTMLElement& element = toHTMLElement(*node);
+    return element.hasTagName(uTag) || element.hasTagName(sTag) || element.hasTagName(strikeTag)
+        || element.hasTagName(iTag) || element.hasTagName(emTag) || element.hasTagName(bTag) || element.hasTagName(strongTag);
+}
+
 Element* associatedElementOf(const Position& position)
 {
     Node* node = position.anchorNode();