Implement hot mode invocation for idle time spell checker

third_party/WebKit/Source/core/editing/Editor.h

Index: third_party/WebKit/Source/core/editing/Editor.h
diff --git a/third_party/WebKit/Source/core/editing/Editor.h b/third_party/WebKit/Source/core/editing/Editor.h
index 6c05079cfa993060965fbb8be0a2a05bf16e5563..e1593cc42a8d8444bcaed2f15383a25a6a1b705a 100644
--- a/third_party/WebKit/Source/core/editing/Editor.h
+++ b/third_party/WebKit/Source/core/editing/Editor.h
@@ -198,6 +198,7 @@ class CORE_EXPORT Editor final : public GarbageCollectedFinalized<Editor> {
   void undo();
   bool canRedo();
   void redo();
+  UndoStack& undoStack() const { return *m_undoStack; }

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

This should be |const UndoStack&|. Except for Editor, we should not change
|UndoStack|.

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

Compile error if changed to |const UndoStack&|: binding value of type 'const
blink::UndoStack' to reference to type 'blink::UndoStack' drops 'const'
qualifier

 
   void setBaseWritingDirection(WritingDirection);