More precise use of multiline state

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

Index: third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp b/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp
index 924e391ebe25113e85d14b37112b80eb7878781d..3c086e529dfd91d301098eb0c6bd197aaf8cbb90 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp
@@ -792,6 +792,35 @@ void AXNodeObject::AccessibilityChildrenFromAttribute(
   }
 }
 
+bool AXNodeObject::IsMultiline() const {
+  Node* node = this->GetNode();
+  if (!node)
+    return false;
+
+  const AccessibilityRole role = RoleValue();
+  const bool is_edit_box = role == kSearchBoxRole || role == kTextFieldRole;
+  if (!IsEditable() && !is_edit_box)
+    return false;  // Doesn't support multiline
+
+  // Supports aria-multiline, so check for attribute
+  bool is_multiline = false;
+  if (HasAOMPropertyOrARIAAttribute(AOMBooleanProperty::kMultiline,
+                                    is_multiline)) {
+    return is_multiline;
+  }
+
+  // Default for <textarea> is true
+  if (isHTMLTextAreaElement(*node))
+    return true;
+
+  // Default for other edit boxes i false
+  if (is_edit_box)
+    return false;
+
+  // Root of contenteditable area
+  return HasContentEditableAttributeSet();
+}
+
 // This only returns true if this is the element that actually has the
 // contentEditable attribute set, unlike node->hasEditableStyle() which will
 // also return true if an ancestor is editable.