Fix the crash bug about selecting a marquee element.

Source/core/dom/Position.cpp

Index: Source/core/dom/Position.cpp
diff --git a/Source/core/dom/Position.cpp b/Source/core/dom/Position.cpp
index 9527031845c8f97d0286f92dffeb88f81c7adb39..71499a0276695279437bc9fcd131249752baca18 100644
--- a/Source/core/dom/Position.cpp
+++ b/Source/core/dom/Position.cpp
@@ -547,6 +547,11 @@ static bool endsOfNodeAreVisuallyDistinctPositions(Node* node)
     if (node->hasTagName(tableTag))
         return false;
 
+    // A Marquee element are movings so we should assume the element's position

[leviw_travelin_and_unemployed, 2014/02/14 04:57:46]

I'd change this to something like "Marquee elements are moving so we should
assume their ends are always visibly distinct."

[yoichio, 2014/02/19 08:00:30]

Done.

+    // is always distinct from the node's one.
+    if (node->hasTagName(marqueeTag))
+        return true;
+
     // There is a VisiblePosition inside an empty inline-block container.
     return node->renderer()->isReplaced() && canHaveChildrenForEditing(node) && toRenderBox(node->renderer())->height() != 0 && !node->firstChild();
 }