[WIP] Move layout states into the DocumentLifecycle state machine

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index 6cbf61b0d70083a0a2897d15925d173d7540b60a..d21c4a4caa3b8bdd737bfb3db32283ada019c354 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -606,9 +606,10 @@ public:
 
     void setParsing(bool);
     bool parsing() const { return m_bParsing; }
-    int minimumLayoutDelay();
 
     bool shouldScheduleLayout();
+    bool shouldScheduleStyleRecalc();
+
     bool shouldParserYieldAgressivelyBeforeScriptExecution();
     int elapsedTime() const;
 
@@ -998,7 +999,6 @@ public:
     void setNeedsNotifyRemoveAllPendingStylesheet() { m_needsNotifyRemoveAllPendingStylesheet = true; }
     void clearStyleResolver();
 
-    bool inStyleRecalc() const { return m_lifecycle.state() == DocumentLifecycle::InStyleRecalc; }
 
     // Return a Locale for the default locale if the argument is null or empty.
     Locale& getCachedLocale(const AtomicString& locale = nullAtom);
@@ -1027,8 +1027,10 @@ public:
     Frame* executingFrame();
 
     DocumentLifecycleNotifier& lifecycleNotifier();
+    DocumentLifecycle& lifecycle() { return m_lifecycle; }
     bool isActive() const { return m_lifecycle.isActive(); }
     bool isStopped() const { return m_lifecycle.state() == DocumentLifecycle::Stopped; }
+    bool inStyleRecalc() const { return m_lifecycle.state() == DocumentLifecycle::InStyleRecalc; }
 
     enum HttpRefreshType {
         HttpRefreshFromHeader,
@@ -1236,7 +1238,6 @@ private:
     LoadEventProgress m_loadEventProgress;
 
     double m_startTime;
-    bool m_overMinimumLayoutThreshold;
 
     OwnPtr<ScriptRunner> m_scriptRunner;