Add float version of gfx::Range

ui/gfx/render_text_harfbuzz.h

 // Copyright 2014 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 UI_GFX_RENDER_TEXT_HARFBUZZ_H_
 #define UI_GFX_RENDER_TEXT_HARFBUZZ_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "third_party/harfbuzz-ng/src/hb.h"
 #include "third_party/icu/source/common/unicode/ubidi.h"
 #include "third_party/icu/source/common/unicode/uscript.h"
 #include "ui/gfx/render_text.h"
 
 namespace base {
 namespace i18n {
 class BreakIterator;
 }
 }
 
 namespace gfx {
 
+class Range;
+class RangeF;
+
 namespace internal {
 
-// TODO(ckocagil): Make Range a template class and RangeF an instance of it.
-typedef std::pair<float, float> RangeF;
-
 // Applies std::round to the start and end values of the given RangeF.
-Range GFX_EXPORT RoundRangeF(const RangeF& range_f);
+GFX_EXPORT Range RoundRangeF(const RangeF& range_f);
 
 struct GFX_EXPORT TextRunHarfBuzz {
   TextRunHarfBuzz();
   ~TextRunHarfBuzz();
 
   // Returns the index of the first glyph that corresponds to the character at
   // |pos|.
   size_t CharToGlyph(size_t pos) const;
 
   // Returns the corresponding glyph range of the given character range.
@@ skipping 141 matching lines @@
 
   // Fixed width of glyphs. This should only be set in test environments.
   uint8 glyph_width_for_test_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderTextHarfBuzz);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_HARFBUZZ_H_