RenderText: Allow strike-through line thickness to be customized.

ui/gfx/render_text_mac.mm

 // 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_mac.h"
 
 #import <AppKit/AppKit.h>
 #include <ApplicationServices/ApplicationServices.h>
 #include <CoreText/CoreText.h>
 
@@ skipping 241 matching lines @@
     const TextRun& run = runs_[i];
     renderer->SetForegroundColor(run.foreground);
     renderer->SetTextSize(CTFontGetSize(run.ct_font));
 
     // The painter adds its own ref. So don't |release()| it from the ref ptr in
     // TextRun.
     renderer->SetTypeface(run.typeface);
 
     renderer->DrawPosText(&run.glyph_positions[0], &run.glyphs[0],
                           run.glyphs.size());
-    renderer->DrawDecorations(run.origin.x(), run.origin.y(), run.width,
-                              run.underline, run.strike);
+    if (run.underline)
+      renderer->DrawUnderline(run.origin.x(), run.origin.y(), run.width);
+    if (run.strike)
+      renderer->DrawStrike(run.origin.x(), run.origin.y(), run.width,
+                           strike_thickness_factor());
   }
 }
 
 RenderTextMac::TextRun::TextRun()
     : ct_run(NULL),
       origin(SkPoint::Make(0, 0)),
       width(0),
       foreground(SK_ColorBLACK),
       underline(false),
       strike(false) {}
@@ skipping 203 matching lines @@
   // TODO(karandeepb): This is not invoked on any codepath currently. Style the
   // returned text if need be.
   if (obscured())
     return false;
 
   decorated_text->text = GetTextFromRange(range);
   return true;
 }
 
 }  // namespace gfx