Move Range code to gfx.

ui/base/range/range_win.cc

-// Copyright (c) 2011 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 "ui/base/range/range.h"
-
-#include <limits>
-
-#include "base/logging.h"
-
-namespace ui {
-
-Range::Range(const CHARRANGE& range, LONG total_length) {
-  // Check if this is an invalid range.
-  if (range.cpMin == -1 && range.cpMax == -1) {
-    *this = InvalidRange();
-  } else {
-    DCHECK_GE(range.cpMin, 0);
-    set_start(range.cpMin);
-    // {0,-1} is the "whole range" but that doesn't mean much out of context,
-    // so use the |total_length| parameter.
-    if (range.cpMax == -1) {
-      DCHECK_EQ(0, range.cpMin);
-      DCHECK_NE(-1, total_length);
-      set_end(total_length);
-    } else {
-      set_end(range.cpMax);
-    }
-  }
-}
-
-CHARRANGE Range::ToCHARRANGE() const {
-  CHARRANGE r = { -1, -1 };
-  if (!IsValid())
-    return r;
-
-  const LONG kLONGMax = std::numeric_limits<LONG>::max();
-  CHECK_LE(static_cast<LONG>(start()), kLONGMax);
-  CHECK_LE(static_cast<LONG>(end()), kLONGMax);
-  r.cpMin = static_cast<LONG>(start());
-  r.cpMax = static_cast<LONG>(end());
-  return r;
-}
-
-}  // namespace gfx