Draw a single underline for text-decoration-style: [dashed, dotted].

Source/platform/graphics/GraphicsContext.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 749 matching lines @@
 
     DrawLooper drawLooper;
     drawLooper.addShadow(shadowOffset, shadowBlur, shadowColor,
         DrawLooper::ShadowRespectsTransforms, DrawLooper::ShadowIgnoresAlpha);
     setDrawLooper(drawLooper);
     fillRectWithRoundedHole(outerRect, roundedHole, fillColor);
     restore();
     clearDrawLooper();
 }
 
-// This is only used to draw borders.
 void GraphicsContext::drawLine(const IntPoint& point1, const IntPoint& point2)
 {
     if (paintingDisabled())
         return;
 
     StrokeStyle penStyle = strokeStyle();
     if (penStyle == NoStroke)
         return;
 
     SkPaint paint;
@@ skipping 167 matching lines @@
 }
 
 void GraphicsContext::drawLineForText(const FloatPoint& pt, float width, bool printing)
 {
     if (paintingDisabled())
         return;
 
     if (width <= 0)
         return;
 
-    int thickness = SkMax32(static_cast<int>(strokeThickness()), 1);
-    SkRect r;
-    r.fLeft = WebCoreFloatToSkScalar(pt.x());
-    // Avoid anti-aliasing lines. Currently, these are always horizontal.
-    // Round to nearest pixel to match text and other content.
-    r.fTop = WebCoreFloatToSkScalar(floorf(pt.y() + 0.5f));
-    r.fRight = r.fLeft + WebCoreFloatToSkScalar(width);
-    r.fBottom = r.fTop + SkIntToScalar(thickness);
-
     SkPaint paint;
     switch (strokeStyle()) {
     case NoStroke:
     case SolidStroke:
     case DoubleStroke:
-    case WavyStroke:
+    case WavyStroke: {
+        int thickness = SkMax32(static_cast<int>(strokeThickness()), 1);
+        SkRect r;
+        r.fLeft = WebCoreFloatToSkScalar(pt.x());
+        // Avoid anti-aliasing lines. Currently, these are always horizontal.
+        // Round to nearest pixel to match text and other content.
+        r.fTop = WebCoreFloatToSkScalar(floorf(pt.y() + 0.5f));
+        r.fRight = r.fLeft + WebCoreFloatToSkScalar(width);
+        r.fBottom = r.fTop + SkIntToScalar(thickness);
         setupPaintForFilling(&paint);
-        break;
+        // Text lines are drawn using the stroke color.
+        paint.setColor(effectiveStrokeColor());
+        drawRect(r, paint);
+        return;
+    }
     case DottedStroke:
-    case DashedStroke:
-        setupPaintForStroking(&paint);
-        break;
+    case DashedStroke: {
+        int y = floorf(pt.y() + std::max<float>(strokeThickness() / 2.0f, 0.5f));
+        drawLine(IntPoint(pt.x(), y), IntPoint(pt.x() + width, y));
+        return;
+    }
     }
 
-    // Text lines are drawn using the stroke color.
-    paint.setColor(effectiveStrokeColor());
-    drawRect(r, paint);
+    ASSERT_NOT_REACHED();
 }
 
 // Draws a filled rectangle with a stroked border.
 void GraphicsContext::drawRect(const IntRect& rect)
 {
     if (paintingDisabled())
         return;
 
     ASSERT(!rect.isEmpty());
     if (rect.isEmpty())
@@ skipping 1021 matching lines @@
 
 void GraphicsContext::didDrawTextInRect(const SkRect& textRect)
 {
     if (m_trackTextRegion) {
         TRACE_EVENT0("skia", "PlatformContextSkia::trackTextRegion");
         m_textRegion.join(textRect);
     }
 }
 
 }