Current work-in-progress crbug.com/567021

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 0d2a226c6189e280ea10d867a94116f12ef14c56..7fed67219759cd2bfd15b3cecf98c39d24a18340 100644
--- a/third_party/WebKit/Source/core/css/CSSStyleSheet.h
+++ b/third_party/WebKit/Source/core/css/CSSStyleSheet.h
@@ -23,6 +23,7 @@
 
 #include "core/CoreExport.h"
 #include "core/css/CSSRule.h"
+#include "core/css/MediaQueryEvaluator.h"
 #include "core/css/StyleSheet.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Noncopyable.h"
@@ -40,11 +41,6 @@ class MediaQuerySet;
 class SecurityOrigin;
 class StyleSheetContents;
 
-enum StyleSheetUpdateType {
-    PartialRuleUpdate,
-    EntireStyleSheetUpdate
-};
-
 class CORE_EXPORT CSSStyleSheet final : public StyleSheet {
     DEFINE_WRAPPERTYPEINFO();
     WTF_MAKE_NONCOPYABLE(CSSStyleSheet);
@@ -89,6 +85,9 @@ public:
     Document* ownerDocument() const;
     MediaQuerySet* mediaQueries() const { return m_mediaQueries.get(); }
     void setMediaQueries(MediaQuerySet*);
+    bool matchesMediaQueries(const MediaQueryEvaluator&);
+    const MediaQueryResultList& viewportDependentMediaQueryResults() const { return m_viewportDependentMediaQueryResults; }
+    const MediaQueryResultList& deviceDependentMediaQueryResults() const { return m_deviceDependentMediaQueryResults; }
     void setTitle(const String& title) { m_title = title; }
     // Set by LinkStyle iff CORS-enabled fetch of stylesheet succeeded from this origin.
     void setAllowRuleAccessFromOrigin(PassRefPtr<SecurityOrigin> allowedOrigin);
@@ -107,7 +106,7 @@ public:
 
     void willMutateRules();
     void didMutateRules();
-    void didMutate(StyleSheetUpdateType = PartialRuleUpdate);
+    void didMutate();
 
     StyleSheetContents* contents() const { return m_contents.get(); }
 
@@ -139,6 +138,8 @@ private:
     bool m_isDisabled;
     String m_title;
     Member<MediaQuerySet> m_mediaQueries;
+    MediaQueryResultList m_viewportDependentMediaQueryResults;
+    MediaQueryResultList m_deviceDependentMediaQueryResults;
 
     RefPtr<SecurityOrigin> m_allowRuleAccessFromOrigin;