[LayoutNG] Move remaining ng_units structs to their own files

third_party/WebKit/Source/core/layout/ng/geometry/ng_static_position.cc

+// 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/layout/ng/geometry/ng_static_position.h"
+
+namespace blink {
+
+NGStaticPosition NGStaticPosition::Create(NGWritingMode writing_mode,
+                                          TextDirection direction,
+                                          NGPhysicalOffset offset) {
+  NGStaticPosition position;
+  position.offset = offset;
+  switch (writing_mode) {
+    case kHorizontalTopBottom:
+      position.type = (direction == TextDirection::kLtr) ? kTopLeft : kTopRight;
+      break;
+    case kVerticalRightLeft:
+    case kSidewaysRightLeft:
+      position.type =
+          (direction == TextDirection::kLtr) ? kTopRight : kBottomRight;
+      break;
+    case kVerticalLeftRight:
+      position.type =
+          (direction == TextDirection::kLtr) ? kTopLeft : kBottomLeft;
+      break;
+    case kSidewaysLeftRight:
+      position.type =
+          (direction == TextDirection::kLtr) ? kBottomLeft : kTopLeft;
+      break;
+  }
+  return position;
+}
+
+}  // namespace blink