Collect media query results for non-matching stylesheets.

third_party/WebKit/Source/core/css/CSSStyleSheet.h

Index: third_party/WebKit/Source/core/css/CSSStyleSheet.h
diff --git a/third_party/WebKit/Source/core/css/CSSStyleSheet.h b/third_party/WebKit/Source/core/css/CSSStyleSheet.h
index 9181e7c715357f9184becc502e2b4c8856ff79d3..458632c2256bdfcb79c6bed8c5575a9637ce2a0c 100644
--- a/third_party/WebKit/Source/core/css/CSSStyleSheet.h
+++ b/third_party/WebKit/Source/core/css/CSSStyleSheet.h
@@ -103,6 +103,10 @@ class CORE_EXPORT CSSStyleSheet final : public StyleSheet {
   const MediaQuerySet* MediaQueries() const { return media_queries_; }
   void SetMediaQueries(MediaQuerySet*);
   bool MatchesMediaQueries(const MediaQueryEvaluator&);
+  bool HasMediaQueryResults() const {
+    return !viewport_dependent_media_query_results_.IsEmpty() ||
+           !device_dependent_media_query_results_.IsEmpty();
+  }
   const MediaQueryResultList& ViewportDependentMediaQueryResults() const {
     return viewport_dependent_media_query_results_;
   }