Use master StyleEngine to evaluate MQ in html imports.

third_party/WebKit/Source/core/dom/DocumentStyleSheetCollection.h

Index: third_party/WebKit/Source/core/dom/DocumentStyleSheetCollection.h
diff --git a/third_party/WebKit/Source/core/dom/DocumentStyleSheetCollection.h b/third_party/WebKit/Source/core/dom/DocumentStyleSheetCollection.h
index 7d4fe51d18cefd7392236e054edb7cea1550cd70..cefb5813bd4c5c5be71fef1092b484b180eb5402 100644
--- a/third_party/WebKit/Source/core/dom/DocumentStyleSheetCollection.h
+++ b/third_party/WebKit/Source/core/dom/DocumentStyleSheetCollection.h
@@ -36,6 +36,7 @@
 namespace blink {
 
 class DocumentStyleSheetCollector;
+class StyleEngine;
 class TreeScope;
 class ViewportStyleResolver;
 
@@ -48,8 +49,9 @@ class DocumentStyleSheetCollection final
     return new DocumentStyleSheetCollection(treeScope);
   }
 
-  void updateActiveStyleSheets();
-  void collectStyleSheets(DocumentStyleSheetCollector&);
+  void updateActiveStyleSheets(StyleEngine& masterEngine);
+  void collectStyleSheets(StyleEngine& masterEngine,
+                          DocumentStyleSheetCollector&);
   void collectViewportRules(ViewportStyleResolver&);
 
   DEFINE_INLINE_VIRTUAL_TRACE() {
@@ -59,7 +61,8 @@ class DocumentStyleSheetCollection final
  private:
   explicit DocumentStyleSheetCollection(TreeScope&);
 
-  void collectStyleSheetsFromCandidates(DocumentStyleSheetCollector&);
+  void collectStyleSheetsFromCandidates(StyleEngine& masterEngine,
+                                        DocumentStyleSheetCollector&);
 };
 
 }  // namespace blink