Add float version of gfx::Range

ui/gfx/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/gfx/range/range.h"
 
 #include <limits>
 
 #include "base/logging.h"
 
 namespace gfx {
 
-Range::Range(const CHARRANGE& range, LONG total_length) {
+Range::Range(const CHARRANGE& range, LONG total_length)
+    : TRangeBase(0, 0) {
   // 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);
@@ skipping 12 matching lines @@
 
   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