Reland of Use NGLogicalRect instead of NGExclusion for exclusions.

third_party/WebKit/Source/core/layout/ng/ng_macros.h

Index: third_party/WebKit/Source/core/layout/ng/ng_macros.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_macros.h b/third_party/WebKit/Source/core/layout/ng/ng_macros.h
new file mode 100644
index 0000000000000000000000000000000000000000..19cfb91356ec1febd5cab00d86a19b7e8b508419
--- /dev/null
+++ b/third_party/WebKit/Source/core/layout/ng/ng_macros.h
@@ -0,0 +1,22 @@
+// 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.
+
+#ifndef ng_macros_h
+#define ng_macros_h
+
+#include "base/macros.h"
+
+namespace blink {
+
+// Macro that can be used to annotate cases where it's OK to ignore writing
+// mode. This is because changing the writing mode establishes a new formatting
+// context and can be ignored while accessing some properties that are only
+// stored in physical constraint space. Example: MarginStrut.
+#ifndef WRITING_MODE_IGNORED
+#define WRITING_MODE_IGNORED(message)
+#endif
+
+}  // namespace blink
+
+#endif  // ng_macros_h