Does this fix things?

src/effects/gradients/SkGradientShader.cpp

 /*
  * 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.
  */
 
 #include "SkGradientShaderPriv.h"
 #include "SkLinearGradient.h"
 #include "SkRadialGradient.h"
@@ skipping 143 matching lines @@
             int count = desc.fCount + dummyLast;
             for (int i = startIndex; i < count; i++) {
                 // force the last value to be 1.0
                 SkScalar curr;
                 if (i == desc.fCount) {  // we're really at the dummyLast
                     curr = 1;
                 } else {
                     curr = SkScalarPin(desc.fPos[i], 0, 1);
                 }
                 *origPosPtr++ = curr;
-                
+
                 recs->fPos = SkScalarToFixed(curr);
-                if (curr > prev) {
-                    recs->fScale = (1 << 24) / SkScalarToFixed(curr - prev);
+                SkFixed diff = SkScalarToFixed(curr - prev);
+                if (diff > 0) {
+                    recs->fScale = (1 << 24) / diff;
                 } else {
                     recs->fScale = 0; // ignore this segment
                 }
                 // get ready for the next value
                 prev = curr;
                 recs += 1;
             }
         } else {    // assume even distribution
             fOrigPos = NULL;
 
@@ skipping 1038 matching lines @@
             (*stops)[i] = stop;
             stop = i < outColors - 1 ? stop + random->nextUScalar1() * (1.f - stop) : 1.f;
         }
     }
     *tm = static_cast<SkShader::TileMode>(random->nextULessThan(SkShader::kTileModeCount));
 
     return outColors;
 }
 
 #endif