Implement cold mode invocation for idle time spell checker

third_party/WebKit/Source/core/editing/spellcheck/IdleSpellCheckCallback.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IdleSpellCheckCallback_h
 #define IdleSpellCheckCallback_h
 
 #include "core/dom/IdleRequestCallback.h"
 #include "core/dom/SynchronousMutationObserver.h"
 #include "core/editing/EphemeralRange.h"
@@ skipping 69 matching lines @@
   void hotModeInvocation(IdleDeadline*);
 
   // Transit to ColdModeTimerStarted, if possible. Sets up a timer, and requests
   // cold mode invocation if no critical operation occurs before timer firing.
   void setNeedsColdModeInvocation();
 
   // Functions for cold mode.
   void coldModeTimerFired(TimerBase*);
   void coldModeInvocation(IdleDeadline*);
   bool coldModeFinishesFullDocument() const;
+  void chunkAndRequestFullCheckingFor(const Element&);
 
   // Implements |SynchronousMutationObserver|.
   void contextDestroyed(Document*) final;
 
   State m_state;
   int m_idleCallbackHandle;
   mutable bool m_needsMoreColdModeInvocationForTesting;
   const Member<LocalFrame> m_frame;
   uint64_t m_lastProcessedUndoStepSequence;
+  uint64_t m_lastCheckedDOMTreeVersionInColdMode;
+  Member<Node> m_nextNodeInColdMode;
   TaskRunnerTimer<IdleSpellCheckCallback> m_coldModeTimer;
 };
 
 }  // namespace blink
 
 #endif  // IdleSpellCheckCallback_h