Improve NVPR stroke accuracy to fix thick strokes

src/gpu/gl/GrGLPath.cpp

Index: src/gpu/gl/GrGLPath.cpp
diff --git a/src/gpu/gl/GrGLPath.cpp b/src/gpu/gl/GrGLPath.cpp
index 6417e684f9f61b985f1061ed7c8d47adcc7efdb4..037134aad4685008041a0006221b33d0bc8b05ba 100644
--- a/src/gpu/gl/GrGLPath.cpp
+++ b/src/gpu/gl/GrGLPath.cpp
@@ -178,6 +178,7 @@ void GrGLPath::InitPathObject(GrGLGpu* gpu,
         GR_GL_CALL(gpu->glInterface(), PathParameteri(pathID, GR_GL_PATH_JOIN_STYLE, join));
         GrGLenum cap = cap_to_gl_cap(stroke.getCap());
         GR_GL_CALL(gpu->glInterface(), PathParameteri(pathID, GR_GL_PATH_END_CAPS, cap));
+        GR_GL_CALL(gpu->glInterface(), PathParameterf(pathID, GR_GL_PATH_STROKE_BOUND, 0.02f));
     }
 }