Revert of Remove unused (by clients) SkUnitMapper (https://codereview.chromium.org/283273002/)

gm/shaderbounds.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 "gm.h"
 #include "SkGradientShader.h"
 
 namespace skiagm {
 
 static SkShader* MakeLinear(SkScalar width, SkScalar height, bool alternate,
                             const SkMatrix& localMatrix) {
   SkPoint pts[2] = { {0, 0}, {width, height}};
   SkColor colors[2] = {SK_ColorRED, SK_ColorGREEN};
   if (alternate) {
     pts[1].fY = 0;
     colors[0] = SK_ColorBLUE;
     colors[1] = SK_ColorYELLOW;
   }
   return SkGradientShader::CreateLinear(pts, colors, NULL, 2,
-                                        SkShader::kClamp_TileMode, 0, &localMatrix);
+                                        SkShader::kClamp_TileMode, NULL, 0, &localMatrix);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 class ShaderBoundsGM : public GM {
 public:
     typedef SkShader* (*ShaderGenFunc)(SkScalar width, SkScalar height,
                                        bool alternate, const SkMatrix& localMatrix);
     ShaderBoundsGM(ShaderGenFunc maker, const SkString& name)
         : fShaderMaker(maker),
@@ skipping 68 matching lines @@
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) {
     return new ShaderBoundsGM(MakeLinear, SkString("shaderbounds_linear"));
 }
 static GMRegistry reg(MyFactory);
 
 }