Implement hot mode invocation for idle time spell checker

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

Index: third_party/WebKit/Source/core/editing/commands/UndoStack.h
diff --git a/third_party/WebKit/Source/core/editing/commands/UndoStack.h b/third_party/WebKit/Source/core/editing/commands/UndoStack.h
index 8f7e3c837d17fa4cdb9c5a298650be0ea64925d0..b26aaf5049b26c54c14a98d047ebabeda73c8c87 100644
--- a/third_party/WebKit/Source/core/editing/commands/UndoStack.h
+++ b/third_party/WebKit/Source/core/editing/commands/UndoStack.h
@@ -40,6 +40,8 @@ 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> {
@@ -56,13 +58,13 @@ class UndoStack final : public GarbageCollected<UndoStack> {
   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;