Stop valgrind bot from crashing

gm/surface.cpp

 /*
  * Copyright 2014 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"
 #include "SkSurface.h"
@@ skipping 67 matching lines @@
 
         // must be opaque to have a hope of testing LCD text
         const SkImageInfo info = SkImageInfo::MakeN32(W, H, kOpaque_SkAlphaType,
                                                       canvas->imageInfo().profileType());
         SkSurfaceProps canvasProps(SkSurfaceProps::kLegacyFontHost_InitType);
         bool gammaCorrect = canvas->getProps(&canvasProps) && canvasProps.isGammaCorrect();
 
         const struct {
             SkPixelGeometry fGeo;
             const char*     fLabel;
-        } rec[] = {
+        } recs[] = {
             { kUnknown_SkPixelGeometry, "Unknown" },
             { kRGB_H_SkPixelGeometry,   "RGB_H" },
             { kBGR_H_SkPixelGeometry,   "BGR_H" },
             { kRGB_V_SkPixelGeometry,   "RGB_V" },
             { kBGR_V_SkPixelGeometry,   "BGR_V" },
         };
 
         SkScalar x = 0;
         for (int disallowAA = 0; disallowAA <= 1; ++disallowAA) {
             for (int disallowDither = 0; disallowDither <= 1; ++disallowDither) {
                 SkScalar y = 0;
-                for (size_t i = 0; i < SK_ARRAY_COUNT(rec); ++i) {
-                    auto surface(make_surface(ctx, info, rec[i].fGeo, disallowAA, disallowDither,
+                for (const auto& rec : recs) {
+                    auto surface(make_surface(ctx, info, rec.fGeo, disallowAA, disallowDither,
                                               gammaCorrect));
-                    test_draw(surface->getCanvas(), rec[i].fLabel);
+                    if (!surface) {
+                        SkDebugf("failed to create surface! label: %s AA: %s dither: %s\n",
+                                 rec.fLabel, (disallowAA == 1 ? "disallowed" : "allowed"),
+                                 (disallowDither == 1 ? "disallowed" : "allowed"));
+                        continue;
+                    }
+                    test_draw(surface->getCanvas(), rec.fLabel);
                     surface->draw(canvas, x, y, nullptr);
                     y += H;
                 }
                 x += W;
             }
         }
     }
 
 private:
     typedef GM INHERITED;
@@ skipping 42 matching lines @@
         SkASSERT(equal(surf->props(), surf2->props()));
 
         sk_sp<SkImage> image2(surf2->makeImageSnapshot());
         canvas->drawImage(image2.get(), 10 + SkIntToScalar(image->width()) + 10, 10, nullptr);
     }
 
 private:
     typedef GM INHERITED;
 };
 DEF_GM( return new NewSurfaceGM )