Implement hot mode invocation for idle time spell checker

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

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 22 matching lines @@
 
 #include "platform/heap/Handle.h"
 #include "wtf/Deque.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class LocalFrame;
 class UndoStep;
 
+typedef HeapDeque<Member<UndoStep>> UndoStepStack;

[yosin_UTC9, 2017/03/02 03:38:40]

nit: using UndoStepStack = HeapDeque<Member<UndoStep>>;

+
 // |UndoStack| is owned by and always 1:1 to |Editor|. Since |Editor| is 1:1 to
 // |LocalFrame|, |UndoStack| is also 1:1 to |LocalFrame|.
 class UndoStack final : public GarbageCollected<UndoStack> {
   WTF_MAKE_NONCOPYABLE(UndoStack);
 
  public:
   static UndoStack* create();
 
   void registerUndoStep(UndoStep*);
   void registerRedoStep(UndoStep*);
   bool canUndo() const;
   bool canRedo() const;
   void undo();
   void redo();
   void clear();
 
+  const UndoStepStack& undoSteps() const { return m_undoStack; }

[yosin_UTC9, 2017/03/02 03:38:40]

Please provide high level API for usage base. We don't want to expose internal
data structure.

[Xiaocheng, 2017/03/02 04:34:59]

Will do.

+
   DECLARE_TRACE();
 
  private:
   UndoStack();
 
-  typedef HeapDeque<Member<UndoStep>> UndoStepStack;
-
   bool m_inRedo;
   UndoStepStack m_undoStack;
   UndoStepStack m_redoStack;
 };
 
 }  // namespace blink
 
 #endif