Don't allow out-of-flow positioned and floating children under LayoutMedia

third_party/WebKit/Source/core/layout/LayoutMediaTest.cpp

+// Copyright 2017 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/layout/LayoutVideo.h"
+
+#include "core/layout/LayoutTestHelper.h"
+
+namespace blink {
+
+using LayoutMediaTest = RenderingTest;
+
+TEST_F(LayoutMediaTest, DisallowInlineChild) {
+  setBodyInnerHTML(
+      "<style>"
+      "  ::-webkit-media-controls { display: inline; }"
+      "</style>"
+      "<video id='video'></video>");
+
+  EXPECT_FALSE(getLayoutObjectByElementId("video")->slowFirstChild());
+}
+
+TEST_F(LayoutMediaTest, DisallowBlockChild) {
+  setBodyInnerHTML(
+      "<style>"
+      "  ::-webkit-media-controls { display: block; }"
+      "</style>"
+      "<video id='video'></video>");
+
+  EXPECT_FALSE(getLayoutObjectByElementId("video")->slowFirstChild());
+}
+
+TEST_F(LayoutMediaTest, DisallowOutOfFlowPositionedChild) {
+  setBodyInnerHTML(
+      "<style>"
+      "  ::-webkit-media-controls { position: absolute; }"
+      "</style>"
+      "<video id='video'></video>");
+
+  EXPECT_FALSE(getLayoutObjectByElementId("video")->slowFirstChild());
+}
+
+TEST_F(LayoutMediaTest, DisallowFloatingChild) {
+  setBodyInnerHTML(
+      "<style>"
+      "  ::-webkit-media-controls { float: left; }"
+      "</style>"
+      "<video id='video'></video>");
+
+  EXPECT_FALSE(getLayoutObjectByElementId("video")->slowFirstChild());
+}
+
+}  // namespace blink