Incorrect setHasMediaQueries() when @media rule is dropped.

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

Index: third_party/WebKit/Source/core/css/StyleSheetContentsTest.cpp
diff --git a/third_party/WebKit/Source/core/css/StyleSheetContentsTest.cpp b/third_party/WebKit/Source/core/css/StyleSheetContentsTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..dc7ce4ed6d4aab6fb9cceb4d9f0e925328959d1c
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/StyleSheetContentsTest.cpp
@@ -0,0 +1,31 @@
+// 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/StyleSheetContents.h"
+
+#include "core/css/CSSTestHelper.h"
+#include "core/css/parser/CSSParser.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+TEST(StyleSheetContentsTest, InsertMediaRule)
+{
+    CSSParserContext context(HTMLStandardMode, nullptr);
+
+    RefPtrWillBeRawPtr<StyleSheetContents> styleSheet = StyleSheetContents::create(context);
+    styleSheet->parseString("@namespace ns url(test);");
+    EXPECT_EQ(1U, styleSheet->ruleCount());
+
+    styleSheet->setMutable();
+    styleSheet->wrapperInsertRule(CSSParser::parseRule(context, styleSheet, "@media all { div { color: pink } }"), 0);
+    EXPECT_EQ(1U, styleSheet->ruleCount());
+    EXPECT_FALSE(styleSheet->hasMediaQueries());
+
+    styleSheet->wrapperInsertRule(CSSParser::parseRule(context, styleSheet, "@media all { div { color: green } }"), 1);
+    EXPECT_EQ(2U, styleSheet->ruleCount());
+    EXPECT_TRUE(styleSheet->hasMediaQueries());
+}
+
+} // namespace blink