linux: Make RenderTextPango avoid clipping underlines.

ui/gfx/platform_font_pango.cc

Index: ui/gfx/platform_font_pango.cc
diff --git a/ui/gfx/platform_font_pango.cc b/ui/gfx/platform_font_pango.cc
index 403b8364bce918dfbf130e97de1b9ebd43b57039..c40874040965bf5dafa98dd21ec3f782bde5cc4c 100644
--- a/ui/gfx/platform_font_pango.cc
+++ b/ui/gfx/platform_font_pango.cc
@@ -130,16 +130,6 @@ PlatformFontPango::PlatformFontPango(const std::string& font_name,
                   query.style, gfx::GetFontRenderParams(query, NULL));
 }
 
-double PlatformFontPango::underline_position() const {
-  const_cast<PlatformFontPango*>(this)->InitPangoMetrics();
-  return underline_position_pixels_;
-}
-
-double PlatformFontPango::underline_thickness() const {
-  const_cast<PlatformFontPango*>(this)->InitPangoMetrics();
-  return underline_thickness_pixels_;
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // PlatformFontPango, PlatformFont implementation:
 
@@ -283,8 +273,6 @@ void PlatformFontPango::InitFromDetails(
 
   pango_metrics_inited_ = false;
   average_width_pixels_ = 0.0f;
-  underline_position_pixels_ = 0.0f;
-  underline_thickness_pixels_ = 0.0f;
 }
 
 void PlatformFontPango::InitFromPlatformFont(const PlatformFontPango* other) {
@@ -298,8 +286,6 @@ void PlatformFontPango::InitFromPlatformFont(const PlatformFontPango* other) {
   cap_height_pixels_ = other->cap_height_pixels_;
   pango_metrics_inited_ = other->pango_metrics_inited_;
   average_width_pixels_ = other->average_width_pixels_;
-  underline_position_pixels_ = other->underline_position_pixels_;
-  underline_thickness_pixels_ = other->underline_thickness_pixels_;
 }
 
 void PlatformFontPango::PaintSetup(SkPaint* paint) const {
@@ -318,19 +304,6 @@ void PlatformFontPango::InitPangoMetrics() {
     ScopedPangoFontDescription pango_desc(GetNativeFont());
     PangoFontMetrics* pango_metrics = GetPangoFontMetrics(pango_desc.get());
 
-    underline_position_pixels_ =
-        pango_font_metrics_get_underline_position(pango_metrics) /
-        PANGO_SCALE;
-
-    // TODO(davemoore): Come up with a better solution.
-    // This is a hack, but without doing this the underlines
-    // we get end up fuzzy. So we align to the midpoint of a pixel.
-    underline_position_pixels_ /= 2;
-
-    underline_thickness_pixels_ =
-        pango_font_metrics_get_underline_thickness(pango_metrics) /
-        PANGO_SCALE;
-
     // First get the Pango-based width (converting from Pango units to pixels).
     const double pango_width_pixels =
         pango_font_metrics_get_approximate_char_width(pango_metrics) /