[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 11e886082f6113a2d330fb948b95ba5d2c0c0423..50738b36665a42183cf9908b8703a0c34b5a547c 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;
 
@@ -997,7 +998,6 @@ 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);
@@ -1026,8 +1026,10 @@ 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,
@@ -1238,7 +1240,6 @@ private:
     LoadEventProgress m_loadEventProgress;
 
     double m_startTime;
-    bool m_overMinimumLayoutThreshold;
 
     OwnPtr<ScriptRunner> m_scriptRunner;