Don't apply style elements or PIs with loading imports.

third_party/WebKit/Source/core/dom/StyleSheetCandidate.cpp

Index: third_party/WebKit/Source/core/dom/StyleSheetCandidate.cpp
diff --git a/third_party/WebKit/Source/core/dom/StyleSheetCandidate.cpp b/third_party/WebKit/Source/core/dom/StyleSheetCandidate.cpp
index f4e5551a159119b7d40a74ff49c61b26e91885e7..d49bb546efb065256e41893994528ef26184fbef 100644
--- a/third_party/WebKit/Source/core/dom/StyleSheetCandidate.cpp
+++ b/third_party/WebKit/Source/core/dom/StyleSheetCandidate.cpp
@@ -79,7 +79,11 @@ bool StyleSheetCandidate::isEnabledViaScript() const
 
 bool StyleSheetCandidate::isEnabledAndLoading() const
 {
-    return isHTMLLink() && !toHTMLLinkElement(node()).isDisabled() && toHTMLLinkElement(node()).styleSheetIsLoading();
+    if (isHTMLLink())
+        return !toHTMLLinkElement(node()).isDisabled() && toHTMLLinkElement(node()).styleSheetIsLoading();
+
+    StyleSheet* sheet = this->sheet();

[esprehn, 2016/04/06 21:03:17]

hmm, can we not make this->sheet() and sheet->disabled() work for <link> ?

[rune, 2016/04/06 22:01:46]

Sheet is null while top-level css is loading for <link>. Relying on
this->sheet() to be non-null would change the behavior for setting the preferred
stylesheet via <link> title. Relying on sheet for load status of xml-stylesheet
is probably wrong for preferred stylesheet set via its title attribute. I don't
think we should try to fix that in this CL, though.

+    return sheet && !sheet->disabled() && sheet->isLoading();
 }
 
 bool StyleSheetCandidate::hasPreferrableName() const