round and bevel hairline rects show the same as miter hairline rects

src/gpu/GrAARectRenderer.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrAARectRenderer.h"
 #include "GrGpu.h"
 #include "gl/GrGLEffect.h"
@@ skipping 741 matching lines @@
     {
         SkScalar w = devRect.width() - dx;
         SkScalar h = devRect.height() - dy;
         spare = SkTMin(w, h);
     }
 
     SkRect devOutside(devRect);
     devOutside.outset(rx, ry);
 
     bool miterStroke = true;
+    // For hairlines, make bevel and round joins appear the same as mitered ones.
     // small miter limit means right angles show bevel...
-    if (stroke.getJoin() != SkPaint::kMiter_Join || stroke.getMiter() < SK_ScalarSqrt2) {
+    if ((width > 0) && (stroke.getJoin() != SkPaint::kMiter_Join ||
+                        stroke.getMiter() < SK_ScalarSqrt2)) {
         miterStroke = false;
     }
 
     if (spare <= 0 && miterStroke) {
         this->fillAARect(gpu, target, devOutside, SkMatrix::I(),
                          devOutside, useVertexCoverage);
         return;
     }
 
     SkRect devInside(devRect);
@@ skipping 146 matching lines @@
     combinedMatrix.mapPoints((SkPoint*)&devInside, (const SkPoint*)&rects[1], 2);
 
     if (devInside.isEmpty()) {
         this->fillAARect(gpu, target, devOutside, SkMatrix::I(), devOutside, useVertexCoverage);
         return;
     }
 
     this->geometryStrokeAARect(gpu, target, devOutside, devOutsideAssist,
                                devInside, useVertexCoverage, true);
 }