Begin tracking why layout is invalidated

Source/core/layout/LayoutObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 423 matching lines @@
     {
         ASSERT(isLayoutInline());
         m_bitfields.setAlwaysCreateLineBoxesForLayoutInline(alwaysCreateLineBoxes);
     }
 
     bool ancestorLineBoxDirty() const { return m_bitfields.ancestorLineBoxDirty(); }
     void setAncestorLineBoxDirty(bool value = true)
     {
         m_bitfields.setAncestorLineBoxDirty(value);
         if (value)
-            setNeedsLayoutAndFullPaintInvalidation();
+            setNeedsLayoutAndFullPaintInvalidation(LayoutInvalidationReason::LineBoxesChanged);
     }
 
     enum FlowThreadState {
         NotInsideFlowThread = 0,
         InsideOutOfFlowThread = 1,
         InsideInFlowThread = 2,
     };
 
     void setFlowThreadStateIncludingDescendants(FlowThreadState);
 
@@ skipping 198 matching lines @@
     // If paintInvalidationContainer and paintInvalidationContainerSkipped are not null, on return *paintInvalidationContainerSkipped
     // is true if the renderer returned is an ancestor of paintInvalidationContainer.
     LayoutObject* container(const LayoutBoxModelObject* paintInvalidationContainer = 0, bool* paintInvalidationContainerSkipped = 0) const;
     LayoutBlock* containerForFixedPosition(const LayoutBoxModelObject* paintInvalidationContainer = 0, bool* paintInvalidationContainerSkipped = 0) const;
 
     virtual LayoutObject* hoverAncestor() const { return parent(); }
 
     Element* offsetParent() const;
 
     void markContainerChainForLayout(bool scheduleRelayout = true, LayoutObject* newRoot = 0, SubtreeLayoutScope* = 0);
-    void setNeedsLayout(MarkingBehavior = MarkContainerChain, SubtreeLayoutScope* = 0);
-    void setNeedsLayoutAndFullPaintInvalidation(MarkingBehavior = MarkContainerChain, SubtreeLayoutScope* = 0);
+    void setNeedsLayout(LayoutInvalidationReasonForTracing, MarkingBehavior = MarkContainerChain, SubtreeLayoutScope* = 0);
+    void setNeedsLayoutAndFullPaintInvalidation(LayoutInvalidationReasonForTracing, MarkingBehavior = MarkContainerChain, SubtreeLayoutScope* = 0);
     void clearNeedsLayout();
     void setChildNeedsLayout(MarkingBehavior = MarkContainerChain, SubtreeLayoutScope* = 0);
     void setNeedsPositionedMovementLayout();
     void setPreferredLogicalWidthsDirty(MarkingBehavior = MarkContainerChain);
     void clearPreferredLogicalWidthsDirty();
     void invalidateContainerPreferredLogicalWidths();
 
-    void setNeedsLayoutAndPrefWidthsRecalc()
+    void setNeedsLayoutAndPrefWidthsRecalc(LayoutInvalidationReasonForTracing reason)
     {
-        setNeedsLayout();
+        setNeedsLayout(reason);
         setPreferredLogicalWidthsDirty();
     }
-    void setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation()
+    void setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(LayoutInvalidationReasonForTracing reason)
     {
-        setNeedsLayoutAndFullPaintInvalidation();
+        setNeedsLayoutAndFullPaintInvalidation(reason);
         setPreferredLogicalWidthsDirty();
     }
 
     void setPositionState(EPosition position)
     {
         ASSERT((position != AbsolutePosition && position != FixedPosition) || isBox());
         m_bitfields.setPositionedState(position);
     }
     void clearPositionedState() { m_bitfields.clearPositionedState(); }
 
@@ skipping 799 matching lines @@
     return true;
 }
 
 inline bool LayoutObject::isBeforeOrAfterContent() const
 {
     return isBeforeContent() || isAfterContent();
 }
 
 // setNeedsLayout() won't cause full paint invalidations as
 // setNeedsLayoutAndFullPaintInvalidation() does. Otherwise the two methods are identical.
-inline void LayoutObject::setNeedsLayout(MarkingBehavior markParents, SubtreeLayoutScope* layouter)
+inline void LayoutObject::setNeedsLayout(LayoutInvalidationReasonForTracing reason, MarkingBehavior markParents, SubtreeLayoutScope* layouter)
 {
     TRACE_EVENT_INSTANT1(
         TRACE_DISABLED_BY_DEFAULT("devtools.timeline.invalidationTracking"),
         "LayoutInvalidationTracking",
         "data",
-        InspectorLayoutInvalidationTrackingEvent::data(this));
+        InspectorLayoutInvalidationTrackingEvent::data(this, reason));
     ASSERT(!isSetNeedsLayoutForbidden());
     bool alreadyNeededLayout = m_bitfields.selfNeedsLayout();
     setSelfNeedsLayout(true);
     if (!alreadyNeededLayout) {
         if (markParents == MarkContainerChain && (!layouter || layouter->root() != this))
             markContainerChainForLayout(true, 0, layouter);
     }
 }
 
-inline void LayoutObject::setNeedsLayoutAndFullPaintInvalidation(MarkingBehavior markParents, SubtreeLayoutScope* layouter)
+inline void LayoutObject::setNeedsLayoutAndFullPaintInvalidation(LayoutInvalidationReasonForTracing reason, MarkingBehavior markParents, SubtreeLayoutScope* layouter)
 {
-    setNeedsLayout(markParents, layouter);
+    setNeedsLayout(reason, markParents, layouter);
     setShouldDoFullPaintInvalidation();
 }
 
 inline void LayoutObject::clearNeedsLayout()
 {
     setNeededLayoutBecauseOfChildren(needsLayoutBecauseOfChildren());
     setLayoutDidGetCalledSinceLastFrame();
     setSelfNeedsLayout(false);
     setEverHadLayout(true);
     setPosChildNeedsLayout(false);
@@ skipping 133 matching lines @@
 void showTree(const blink::LayoutObject*);
 void showLineTree(const blink::LayoutObject*);
 void showLayoutTree(const blink::LayoutObject* object1);
 // We don't make object2 an optional parameter so that showLayoutTree
 // can be called from gdb easily.
 void showLayoutTree(const blink::LayoutObject* object1, const blink::LayoutObject* object2);
 
 #endif
 
 #endif // LayoutObject_h