[import] support document.stylesheets in imported documents.

Source/core/dom/StyleSheetCollection.cpp

Index: Source/core/dom/StyleSheetCollection.cpp
diff --git a/Source/core/dom/StyleSheetCollection.cpp b/Source/core/dom/StyleSheetCollection.cpp
index 853a300bbf5f77d90d41fad246f678bfb4cf53e5..28ac089b5c7b23bbd8d5683d138f14fafdfed3f4 100644
--- a/Source/core/dom/StyleSheetCollection.cpp
+++ b/Source/core/dom/StyleSheetCollection.cpp
@@ -53,6 +53,13 @@ void StyleSheetCollectionBase::swap(StyleSheetCollectionBase& other)
     m_activeAuthorStyleSheets.swap(other.m_activeAuthorStyleSheets);
 }
 
+void StyleSheetCollectionBase::setSheetsForSheetList(const Vector<RefPtr<StyleSheet> >& sheets)
+{
+    // Only called for collection of HTML Imports, that never has active sheets.
+    ASSERT(m_activeAuthorStyleSheets.isEmpty());
+    m_styleSheetsForStyleSheetList = sheets;

[esprehn, 2014/01/23 07:51:03]

swap() I think is what you want, this currently does a copy.

[Hajime Morrita, 2014/01/24 01:25:51]

Done.

+}
+
 void StyleSheetCollectionBase::appendActiveStyleSheets(const Vector<RefPtr<CSSStyleSheet> >& sheets)
 {
     m_activeAuthorStyleSheets.append(sheets);