Track reasons for |Node::SetNeedsStyleRecalc|

Source/core/dom/StyleChangeReason.cpp

Index: Source/core/dom/StyleChangeReason.cpp
diff --git a/Source/core/dom/StyleChangeReason.cpp b/Source/core/dom/StyleChangeReason.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d669b858c838e8ede9f321f7b69b3481a1d96ece
--- /dev/null
+++ b/Source/core/dom/StyleChangeReason.cpp
@@ -0,0 +1,52 @@
+// Copyright 2014 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.
+
+#include "config.h"
+#include "core/dom/StyleChangeReason.h"
+
+namespace blink {
+
+namespace StyleChangeReasonForTracing {
+const char ActivePseudoClass[] = "ActivePseudoClass";
+const char ActiveStylesheetsUpdate[] = "ActiveStylesheetsUpdate";
+const char Animation[] = "Animation";
+const char Attribute[] = "Attribute";
+const char CellBorderPaddingChange[] = "CellBorderPaddingChange";
+const char Control[] = "Control";
+const char ControlValue[] = "ControlValue";
+const char CustomElement[] = "CustomElement";
+const char DesignMode[] = "DesignMode";
+const char DisabledPseudoClass[] = "DisabledPseudoClass";
+const char Drag[] = "Drag";
+const char EmptyPseudoClass[] = "EmptyPseudoClass";
+const char FocusPseudoClass[] = "FocusPseudoClass";
+const char FontSizeChange[] = "FontSizeChange";
+const char Fonts[] = "Fonts";
+const char FrameSet[] = "FrameSet";
+const char FullScreen[] = "FullScreen";
+const char HoverPseudoClass[] = "HoverPseudoClass";
+const char Inline[] = "Inline";
+const char Inspector[] = "Inspector";
+const char InvalidPseudoClass[] = "InvalidPseudoClass";
+const char Language[] = "Language";
+const char LinkColorChange[] = "LinkColorChange";
+const char PlatformColorChange[] = "PlatformColorChange";
+const char Plugin[] = "Plugin";
+const char RequiredOptionalPseudoClass[] = "RequiredOptionalPseudoClass";
+const char SVGContainerSizeChange[] = "SVGContainerSizeChange";
+const char SVGCursor[] = "SVGCursor";
+const char SVGFilterLayerUpdate[] = "SVGFilterLayerUpdate";
+const char Selector[] = "Selector";
+const char Shadow[] = "Shadow";
+const char SiblingSelector[] = "SiblingSelector";
+const char StyleInvalidator[] = "StyleInvalidator";
+const char StyleSheetChange[] = "StyleSheetChange";
+const char ViewportUnits[] = "ViewportUnits";
+const char VisitedLink[] = "VisitedLink";
+const char VisuallyOrdered[] = "VisuallyOrdered";
+const char WritingModeChange[] = "WritingModeChange";
+const char Zoom[] = "Zoom";
+} // namespace StyleChangeReasonForTracing
+
+} // namespace blink