Track reasons for |Node::SetNeedsStyleRecalc|

Source/core/html/HTMLObjectElement.cpp

Index: Source/core/html/HTMLObjectElement.cpp
diff --git a/Source/core/html/HTMLObjectElement.cpp b/Source/core/html/HTMLObjectElement.cpp
index 34be9bfb75b9c9ddf00d1ca7a3dfd412055e41c2..aaa78f656364ad39ca239595757e2c3afbf83e74 100644
--- a/Source/core/html/HTMLObjectElement.cpp
+++ b/Source/core/html/HTMLObjectElement.cpp
@@ -257,7 +257,7 @@ void HTMLObjectElement::reloadPluginOnAttributeChange(const QualifiedName& name)
     }
     setNeedsWidgetUpdate(true);
     if (needsInvalidation)
-        setNeedsStyleRecalc(SubtreeStyleChange);
+        setNeedsStyleRecalc(StyleRecalcDueToPlugin, SubtreeStyleChange);

[rune, 2014/09/08 08:33:24]

This SubtreeStyleChange is a hack to trigger a re-attach from
HTMLPlugInElement::willRecalcStyle. There is no style recalc needed as such.
See: https://codereview.chromium.org/521603002/

 }
 
 // FIXME: This should be unified with HTMLEmbedElement::updateWidget and
@@ -332,7 +332,7 @@ void HTMLObjectElement::childrenChanged(const ChildrenChange& change)
 {
     if (inDocument() && !useFallbackContent()) {
         setNeedsWidgetUpdate(true);
-        setNeedsStyleRecalc(SubtreeStyleChange);
+        setNeedsStyleRecalc(StyleRecalcDueToPlugin, SubtreeStyleChange);
     }
     HTMLPlugInElement::childrenChanged(change);
 }