Fix eliding of LTR tab title in RTL UI under non-Windows Views.

ui/gfx/canvas.h

 // 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.
 
 #ifndef UI_GFX_CANVAS_H_
 #define UI_GFX_CANVAS_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 345 matching lines @@
   // use. Must be balanced by a call to EndPlatformPaint().
   NativeDrawingContext BeginPlatformPaint();
 
   // Signifies the end of platform drawing using the native drawing context
   // returned by BeginPlatformPaint().
   void EndPlatformPaint();
 
   // Apply transformation on the canvas.
   void Transform(const ui::Transform& transform);
 
-#if defined(OS_WIN)
   // Draws the given string with the beginning and/or the end using a fade
   // gradient. When truncating the head
   // |desired_characters_to_truncate_from_head| specifies the maximum number of
   // characters that can be truncated.
   void DrawFadeTruncatingString(
       const string16& text,
       TruncateFadeMode truncate_mode,
       size_t desired_characters_to_truncate_from_head,
       const gfx::Font& font,
       SkColor color,
       const gfx::Rect& display_rect);
-#endif
 
   skia::PlatformCanvas* platform_canvas() const { return owned_canvas_.get(); }
   SkCanvas* sk_canvas() const { return canvas_; }
   ui::ScaleFactor scale_factor() const { return scale_factor_; }
 
  private:
   // Test whether the provided rectangle intersects the current clip rect.
   bool IntersectsClipRectInt(int x, int y, int w, int h);
   bool IntersectsClipRect(const gfx::Rect& rect);
 
@@ skipping 38 matching lines @@
   // An additional scale can be applied via Canvas::Scale(). However,
   // Canvas::Scale() does not affect |scale_factor_|.
   ui::ScaleFactor scale_factor_;
 
   DISALLOW_COPY_AND_ASSIGN(Canvas);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_CANVAS_H_