[Invalidation Tracking] Trace StyleInvalidator setNeedsStyleRecalc

Source/core/css/invalidation/StyleInvalidationTracingEnabledFlag.h

Index: Source/core/css/invalidation/StyleInvalidationTracingEnabledFlag.h
diff --git a/Source/core/css/invalidation/StyleInvalidationTracingEnabledFlag.h b/Source/core/css/invalidation/StyleInvalidationTracingEnabledFlag.h
new file mode 100644
index 0000000000000000000000000000000000000000..affb3af32c0eb56997b3be7002052be199c4a512
--- /dev/null
+++ b/Source/core/css/invalidation/StyleInvalidationTracingEnabledFlag.h
@@ -0,0 +1,17 @@
+// 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.
+
+#ifndef StyleInvalidationTracingEnabledFlag_h
+#define StyleInvalidationTracingEnabledFlag_h
+
+namespace blink {
+
+enum StyleInvalidationTracingEnabledFlag {
+    StyleInvalidationTracingDisabled,
+    StyleInvalidationTracingEnabled
+};
+
+} // namespace blink
+
+#endif // StyleInvalidationTracingEnabledFlag_h