Add float version of gfx::Range

ui/gfx/render_text_unittest.cc

 // Copyright (c) 2012 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/render_text.h"
 
 #include <algorithm>
 
 #include "base/format_macros.h"
 #include "base/i18n/break_iterator.h"
@@ skipping 2143 matching lines @@
     base::string16 text = WideToUTF16(cases[i]);
     render_text.SetText(text);
     render_text.EnsureLayout();
     ASSERT_EQ(1U, render_text.runs_.size());
     internal::TextRunHarfBuzz* run = render_text.runs_[0];
 
     base::i18n::BreakIterator* iter = render_text.grapheme_iterator_.get();
     auto first_grapheme_bounds = run->GetGraphemeBounds(iter, 0);
     EXPECT_EQ(first_grapheme_bounds, run->GetGraphemeBounds(iter, 1));
     auto second_grapheme_bounds = run->GetGraphemeBounds(iter, 2);
-    EXPECT_EQ(first_grapheme_bounds.second, second_grapheme_bounds.first);
+    EXPECT_EQ(first_grapheme_bounds.end(), second_grapheme_bounds.start());
   }
 }
 
 // Test the partition of a multi-grapheme cluster into grapheme ranges.
 TEST_F(RenderTextTest, HarfBuzz_SubglyphGraphemePartition) {
   struct {
     uint32 glyph_to_char[2];
     Range bounds[4];
     bool is_rtl;
   } cases[] = {
@@ skipping 284 matching lines @@
             base::StringToLowerASCII(fonts[0].GetActualFontNameForTesting()));
 
   scoped_ptr<RenderText> render_text(RenderText::CreateInstance());
   render_text->SetDisplayRect(Rect(0, 0, 25, 25));
   render_text->SetFontList(font_list);
   EXPECT_GT(render_text->GetBaseline(), font_list.GetBaseline());
 }
 #endif
 
 }  // namespace gfx