Move NGConstraintSpace utility methods to a separate file

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

+// 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.
+
+#ifndef NGSpaceUtils_h
+#define NGSpaceUtils_h
+
+#include "core/layout/ng/ng_constraint_space.h"
+#include "core/style/ComputedStyle.h"
+#include "wtf/Optional.h"
+
+namespace blink {
+
+// Whether an in-flow block-level child creates a new formatting context.
+//
+// This will *NOT* check the following cases:
+//  - The child is out-of-flow, e.g. floating or abs-pos.
+//  - The child is a inline-level, e.g. "display: inline-block".
+//  - The child establishes a new formatting context, but should be a child of
+//    another layout algorithm, e.g. "display: table-caption" or flex-item.
+CORE_EXPORT bool IsNewFormattingContextForInFlowBlockLevelChild(

[ikilpatrick, 2017/03/21 01:37:55]

missing? :P

[Gleb Lanbin, 2017/03/21 02:01:10]

what is missing?

+    const NGConstraintSpace& space,
+    const ComputedStyle& style);
+
+// Gets the clearance offset based on the provided {@code style} and list of
+// exclusions that represent left/right float.
+CORE_EXPORT WTF::Optional<LayoutUnit> GetClearanceOffset(
+    const std::shared_ptr<NGExclusions>& exclusions,
+    const ComputedStyle& style);
+
+}  // namespace blink
+
+#endif  // NGSpaceUtils_h