Collect media query results for non-matching stylesheets.

third_party/WebKit/Source/core/css/ActiveStyleSheetsTest.cpp

Index: third_party/WebKit/Source/core/css/ActiveStyleSheetsTest.cpp
diff --git a/third_party/WebKit/Source/core/css/ActiveStyleSheetsTest.cpp b/third_party/WebKit/Source/core/css/ActiveStyleSheetsTest.cpp
index af1c54ca2cb7169d13f6ce2498d84bc0a5f02b6a..1187aa3c1af7f84e9026ac4bbd29b085640a0264 100644
--- a/third_party/WebKit/Source/core/css/ActiveStyleSheetsTest.cpp
+++ b/third_party/WebKit/Source/core/css/ActiveStyleSheetsTest.cpp
@@ -10,6 +10,7 @@
 #include "core/css/StyleSheetContents.h"
 #include "core/css/StyleSheetList.h"
 #include "core/css/parser/CSSParserContext.h"
+#include "core/css/parser/MediaQueryParser.h"
 #include "core/dom/StyleEngine.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/dom/shadow/ShadowRootInit.h"
@@ -409,6 +410,35 @@ TEST_F(ActiveStyleSheetsTest, CompareActiveStyleSheets_DisableAndAppend) {
   EXPECT_EQ(2u, changed_rule_sets.size());
 }
 
+TEST_F(ActiveStyleSheetsTest, CompareActiveStyleSheets_AddRemoveNonMatchingMQ) {
+  ActiveStyleSheetVector old_sheets;
+  ActiveStyleSheetVector new_sheets;
+  HeapHashSet<Member<RuleSet>> changed_rule_sets;
+
+  EXPECT_EQ(
+      kNoActiveSheetsChanged,
+      CompareActiveStyleSheets(old_sheets, new_sheets, changed_rule_sets));
+  EXPECT_EQ(0u, changed_rule_sets.size());
+
+  CSSStyleSheet* sheet1 = CreateSheet();
+  MediaQuerySet* mq =
+      MediaQueryParser::ParseMediaQuerySet("(min-width: 9000px)");
+  sheet1->SetMediaQueries(mq);
+  sheet1->MatchesMediaQueries(MediaQueryEvaluator());
+
+  new_sheets.push_back(std::make_pair(sheet1, nullptr));
+
+  EXPECT_EQ(
+      kActiveSheetsAppended,
+      CompareActiveStyleSheets(old_sheets, new_sheets, changed_rule_sets));
+  EXPECT_EQ(0u, changed_rule_sets.size());
+
+  EXPECT_EQ(
+      kActiveSheetsChanged,
+      CompareActiveStyleSheets(new_sheets, old_sheets, changed_rule_sets));
+  EXPECT_EQ(0u, changed_rule_sets.size());
+}
+
 TEST_F(ApplyRulesetsTest, AddUniversalRuleToDocument) {
   GetDocument().View()->UpdateAllLifecyclePhases();