mac: Prepare for -Wunused-functions.

ui/gfx/canvas_skia.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/canvas.h"
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/font_list.h"
 #include "ui/gfx/insets.h"
 #include "ui/gfx/range/range.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/render_text.h"
 #include "ui/gfx/shadow_value.h"
 #include "ui/gfx/text_elider.h"
 #include "ui/gfx/text_utils.h"
 
 namespace gfx {
 
 namespace {
 
+#if defined(OS_WIN)
 // If necessary, wraps |text| with RTL/LTR directionality characters based on
 // |flags| and |text| content.
 // Returns true if the text will be rendered right-to-left.
 // TODO(msw): Nix this, now that RenderTextWin supports directionality directly.
 bool AdjustStringDirection(int flags, base::string16* text) {
   // TODO(msw): FORCE_LTR_DIRECTIONALITY does not work for RTL text now.
 
   // If the string is empty or LTR was forced, simply return false since the
   // default RenderText directionality is already LTR.
   if (text->empty() || (flags & Canvas::FORCE_LTR_DIRECTIONALITY))
@@ skipping 12 matching lines @@
     return true;
   }
 
   // In the default case, the string should be rendered as LTR. RenderText's
   // default directionality is LTR, so the text doesn't need to be wrapped.
   // Note that individual runs within the string may still be rendered RTL
   // (which will be the case for RTL text under non-RTL locales, since under RTL
   // locales it will be handled by the if statement above).
   return false;
 }
+#endif  // defined(OS_WIN)
 
 // Checks each pixel immediately adjacent to the given pixel in the bitmap. If
 // any of them are not the halo color, returns true. This defines the halo of
 // pixels that will appear around the text. Note that we have to check each
 // pixel against both the halo color and transparent since
 // |DrawStringRectWithHalo| will modify the bitmap as it goes, and cleared
 // pixels shouldn't count as changed.
 bool PixelShouldGetHalo(const SkBitmap& bitmap,
                         int x, int y,
                         SkColor halo_color) {
@@ skipping 357 matching lines @@
   rect.set_height(line_height);
   render_text->SetDisplayRect(rect);
 
   canvas_->save(SkCanvas::kClip_SaveFlag);
   ClipRect(display_rect);
   render_text->Draw(this);
   canvas_->restore();
 }
 
 }  // namespace gfx