CSSMediaRule and CSSSupportsRule inherit from CSSConditionRule

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

Index: third_party/WebKit/Source/core/css/CSSConditionRule.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSConditionRule.cpp b/third_party/WebKit/Source/core/css/CSSConditionRule.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..beefb7e93125440d386ee93d91707b0f7a7be199
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/CSSConditionRule.cpp
@@ -0,0 +1,25 @@
+// 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/CSSConditionRule.h"
+
+#include "core/css/CSSStyleSheet.h"
+
+namespace blink {
+
+CSSConditionRule::CSSConditionRule(StyleRuleCondition* conditionRule,
+                                   CSSStyleSheet* parent)
+    : CSSGroupingRule(conditionRule, parent) {}
+
+CSSConditionRule::~CSSConditionRule() {}
+
+String CSSConditionRule::conditionText() const {
+  return static_cast<StyleRuleCondition*>(m_groupRule.get())->conditionText();
+}
+
+DEFINE_TRACE(CSSConditionRule) {

[meade_UTC10, 2016/10/17 02:58:44]

So long as CSSGroupingRule has a TRACE method, you can probably omit this.

+  CSSGroupingRule::trace(visitor);
+}
+
+}  // namespace blink