[Editing] Store |CommandSource| in |CompositeEditCommand|

third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.h

Index: third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.h
diff --git a/third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.h b/third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.h
index 2289ba003dbe6ab03853a66d221e545f53d649ea..82f56e8e5440553d8d002c231bf62dc8a8cc1345 100644
--- a/third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.h
+++ b/third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.h
@@ -42,6 +42,8 @@ class HTMLElement;
 class HTMLSpanElement;
 class Text;
 
+enum class CommandSource { MenuOrKeyBinding, Dom };
+
 class EditCommandComposition final : public UndoStep {
  public:
   static EditCommandComposition* create(Document*,
@@ -114,7 +116,7 @@ class CORE_EXPORT CompositeEditCommand : public EditCommand {
   DECLARE_VIRTUAL_TRACE();
 
  protected:
-  explicit CompositeEditCommand(Document&);
+  CompositeEditCommand(Document&, CommandSource);
 
   //
   // sugary-sweet convenience functions to help create and apply edit commands
@@ -260,12 +262,15 @@ class CORE_EXPORT CompositeEditCommand : public EditCommand {
 
   Node* splitTreeToNode(Node*, Node*, bool splitAncestor = false);
 
+  CommandSource commandSource() const;
+
   HeapVector<Member<EditCommand>> m_commands;
 
  private:
   bool isCompositeEditCommand() const final { return true; }
 
   Member<EditCommandComposition> m_composition;
+  CommandSource m_source;
 };
 
 DEFINE_TYPE_CASTS(CompositeEditCommand,