Track reasons for |Node::SetNeedsStyleRecalc|

Source/core/page/Page.cpp

Index: Source/core/page/Page.cpp
diff --git a/Source/core/page/Page.cpp b/Source/core/page/Page.cpp
index 9d3755e9dbd63bc1fdb32622294b7d6d1e50db94..8b1f4a44f099e7a6f788a6a70351e238adeeb3b0 100644
--- a/Source/core/page/Page.cpp
+++ b/Source/core/page/Page.cpp
@@ -234,7 +234,7 @@ void Page::scheduleForcedStyleRecalcForAllPages()
     for (HashSet<Page*>::iterator it = allPages().begin(); it != end; ++it)
         for (Frame* frame = (*it)->mainFrame(); frame; frame = frame->tree().traverseNext()) {
             if (frame->isLocalFrame())
-                toLocalFrame(frame)->document()->setNeedsStyleRecalc(SubtreeStyleChange);
+                toLocalFrame(frame)->document()->setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::PlatformColorChange));
         }
 }