Collect media query results for non-matching stylesheets.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/ActiveStyleSheets.h"
 
 #include "bindings/core/v8/V8Binding.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/MediaQueryEvaluator.h"
 #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"
 #include "core/frame/FrameView.h"
 #include "core/html/HTMLElement.h"
 #include "core/testing/DummyPageHolder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
@@ skipping 379 matching lines @@
   new_sheets.push_back(std::make_pair(sheet1, nullptr));
   new_sheets.push_back(
       std::make_pair(sheet2, &sheet2->Contents()->GetRuleSet()));
 
   EXPECT_EQ(
       kActiveSheetsChanged,
       CompareActiveStyleSheets(old_sheets, new_sheets, changed_rule_sets));
   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();
 
   CSSStyleSheet* sheet = CreateSheet("body * { color:red }");
 
   ActiveStyleSheetVector new_style_sheets;
   new_style_sheets.push_back(
       std::make_pair(sheet, &sheet->Contents()->GetRuleSet()));
 
   GetStyleEngine().ApplyRuleSetChanges(GetDocument(), ActiveStyleSheetVector(),
@@ skipping 119 matching lines @@
   ActiveStyleSheetVector old_style_sheets;
   old_style_sheets.push_back(
       std::make_pair(css_sheet, &css_sheet->Contents()->GetRuleSet()));
   GetStyleEngine().ApplyRuleSetChanges(shadow_root, old_style_sheets,
                                        ActiveStyleSheetVector());
 
   EXPECT_TRUE(GetStyleEngine().TreeBoundaryCrossingScopes().IsEmpty());
 }
 
 }  // namespace blink