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

ui/gfx/render_text_harfbuzz.cc

 // 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.
 
 #include "ui/gfx/render_text_harfbuzz.h"
 
 #include <limits>
 #include <set>
 
 #include "base/command_line.h"
@@ skipping 1298 matching lines @@
         renderer->DrawPosText(
             &positions[colored_glyphs.start() - glyphs_range.start()],
             &run.glyphs[colored_glyphs.start()], colored_glyphs.length());
         int start_x = SkScalarRoundToInt(
             positions[colored_glyphs.start() - glyphs_range.start()].x());
         int end_x = SkScalarRoundToInt(
             (colored_glyphs.end() == glyphs_range.end())
                 ? (SkFloatToScalar(segment.width()) + preceding_segment_widths +
                    SkIntToScalar(origin.x()))
                 : positions[colored_glyphs.end() - glyphs_range.start()].x());
-        renderer->DrawDecorations(start_x, origin.y(), end_x - start_x,
-                                  run.underline, run.strike);
+        if (run.underline)
+          renderer->DrawUnderline(start_x, origin.y(), end_x - start_x);
+        if (run.strike)
+          renderer->DrawStrike(start_x, origin.y(), end_x - start_x,
+                               strike_thickness_factor());
       }
       preceding_segment_widths += SkFloatToScalar(segment.width());
     }
   }
 
   UndoCompositionAndSelectionStyles();
 }
 
 size_t RenderTextHarfBuzz::GetRunContainingCaret(
     const SelectionModel& caret) {
@@ skipping 385 matching lines @@
           run.font.Derive(0, style, run.weight));
 
       attribute.strike = run.strike;
       decorated_text->attributes.push_back(attribute);
     }
   }
   return true;
 }
 
 }  // namespace gfx