CSSMediaRule and CSSSupportsRule inherit from CSSConditionRule

third_party/WebKit/Source/core/css/BUILD.gn

 # 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.
 
 import("//third_party/WebKit/Source/core/core.gni")
 
 blink_core_sources("css") {
   split_count = 5
   sources = [
     "ActiveStyleSheets.cpp",
     "ActiveStyleSheets.h",
     "BasicShapeFunctions.cpp",
     "BinaryDataFontFaceSource.cpp",
     "BinaryDataFontFaceSource.h",
     "CSSBasicShapeValues.cpp",
     "CSSBorderImage.cpp",
     "CSSBorderImage.h",
     "CSSBorderImageSliceValue.cpp",
     "CSSBorderImageSliceValue.h",
     "CSSCalculationValue.cpp",
     "CSSCalculationValue.h",
     "CSSColorValue.cpp",
     "CSSColorValue.h",
     "CSSComputedStyleDeclaration.cpp",
+    "CSSConditionRule.cpp",
+    "CSSConditionRule.h",
     "CSSContentDistributionValue.cpp",
     "CSSContentDistributionValue.h",
     "CSSCounterValue.cpp",
     "CSSCounterValue.h",
     "CSSCrossfadeValue.cpp",
     "CSSCrossfadeValue.h",
     "CSSCursorImageValue.cpp",
     "CSSCustomFontData.h",
     "CSSCustomIdentValue.cpp",
     "CSSCustomIdentValue.h",
@@ skipping 338 matching lines @@
     "resolver/TransformBuilder.h",
     "resolver/ViewportStyleResolver.cpp",
     "resolver/ViewportStyleResolver.h",
   ]
 
   configs += [
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
   ]
 }