linux: Make RenderTextPango avoid clipping underlines.

ui/gfx/platform_font_pango.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_PLATFORM_FONT_PANGO_H_
 #define UI_GFX_PLATFORM_FONT_PANGO_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 22 matching lines @@
   // This function is useful when the system font has changed, for example, when
   // the locale has changed.
   static void ReloadDefaultFont();
 
 #if defined(OS_CHROMEOS)
   // Sets the default font. |font_description| is a Pango font description that
   // will be passed to pango_font_description_from_string().
   static void SetDefaultFontDescription(const std::string& font_description);
 #endif
 
-  // Position as an offset from the height of the drawn text, used to draw
-  // an underline. This is a negative number, so the underline would be
-  // drawn at y + height + underline_position.
-  double underline_position() const;
-  // The thickness to draw the underline.
-  double underline_thickness() const;
-
   // Overridden from PlatformFont:
   virtual Font DeriveFont(int size_delta, int style) const OVERRIDE;
   virtual int GetHeight() const OVERRIDE;
   virtual int GetBaseline() const OVERRIDE;
   virtual int GetCapHeight() const OVERRIDE;
   virtual int GetExpectedTextWidth(int length) const OVERRIDE;
   virtual int GetStyle() const OVERRIDE;
   virtual std::string GetFontName() const OVERRIDE;
   virtual std::string GetActualFontNameForTesting() const OVERRIDE;
   virtual int GetFontSize() const OVERRIDE;
@@ skipping 15 matching lines @@
   void InitFromDetails(
       const skia::RefPtr<SkTypeface>& typeface,
       const std::string& font_family,
       int font_size_pixels,
       int style,
       const FontRenderParams& params);
 
   // Initializes this object as a copy of another PlatformFontPango.
   void InitFromPlatformFont(const PlatformFontPango* other);
 
-  // Potentially slow call to get pango metrics (average width, underline info).
+  // Potentially slow call to get pango metrics (average width).
   void InitPangoMetrics();
 
   // Setup a Skia context to use the current typeface.
   void PaintSetup(SkPaint* paint) const;
 
   // Make |this| a copy of |other|.
   void CopyFont(const Font& other);
 
   // The average width of a character, initialized and cached if needed.
   double GetAverageWidth() const;
@@ skipping 11 matching lines @@
 
   // Cached metrics, generated at construction.
   int ascent_pixels_;
   int height_pixels_;
   int cap_height_pixels_;
 
   // The pango metrics are much more expensive so we wait until we need them
   // to compute them.
   bool pango_metrics_inited_;
   double average_width_pixels_;
-  double underline_position_pixels_;
-  double underline_thickness_pixels_;
 
   // The default font, used for the default constructor.
   static Font* default_font_;
 
 #if defined(OS_CHROMEOS)
   // A Pango font description.
   static std::string* default_font_description_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(PlatformFontPango);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_PLATFORM_FONT_PANGO_H_