Add gm that tests shaded stroked rectangles.

include/core/SkPaint.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPaint_DEFINED
 #define SkPaint_DEFINED
 
@@ skipping 391 matching lines @@
         A dash with an on interval of zero also creates a zero length contour.
 
         The zero length contour draws the square cap without rotation, since
         the no direction can be inferred.
     */
     enum Cap {
         kButt_Cap,      //!< begin/end contours with no extension
         kRound_Cap,     //!< begin/end contours with a semi-circle extension
         kSquare_Cap,    //!< begin/end contours with a half square extension
 
-        kCapCount,
+        kLast_Cap = kSquare_Cap,
         kDefault_Cap = kButt_Cap
     };
+    static constexpr int kCapCount = kLast_Cap + 1;
 
     /** Join enum specifies the settings for the paint's strokejoin. This is
         the treatment that is applied to corners in paths and rectangles.
     */
     enum Join {
         kMiter_Join,    //!< connect path segments with a sharp join
         kRound_Join,    //!< connect path segments with a round join
         kBevel_Join,    //!< connect path segments with a flat bevel join
 
-        kJoinCount,
+        kLast_Join = kBevel_Join,
         kDefault_Join = kMiter_Join
     };
+    static constexpr int kJoinCount = kLast_Join + 1;
 
     /** Return the paint's stroke cap type, controlling how the start and end
         of stroked lines and paths are treated.
         @return the line cap style for the paint, used whenever the paint's
                 style is Stroke or StrokeAndFill.
     */
     Cap getStrokeCap() const { return (Cap)fBitfields.fCapType; }
 
     /** Set the paint's stroke cap type.
         @param cap  set the paint's line cap style, used whenever the paint's
@@ skipping 733 matching lines @@
     friend class GrStencilAndCoverTextContext;
     friend class GrPathRendering;
     friend class GrTextUtils;
     friend class GrGLPathRendering;
     friend class SkScalerContext;
     friend class SkTextBaseIter;
     friend class SkCanonicalizePaint;
 };
 
 #endif