Fix alpha textures in NV ES3 contexts on Windows

tests/GLProgramsTest.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This is a GPU-backend specific test. It relies on static intializers to work
 
@@ skipping 129 matching lines @@
     dummyDesc.fConfig = kSkia8888_GrPixelConfig;
     dummyDesc.fWidth = 34;
     dummyDesc.fHeight = 18;
     SkAutoTUnref<GrTexture> dummyTexture1(this->createTexture(dummyDesc, NULL, 0));
     dummyDesc.fFlags = kNone_GrTextureFlags;
     dummyDesc.fConfig = kAlpha_8_GrPixelConfig;
     dummyDesc.fWidth = 16;
     dummyDesc.fHeight = 22;
     SkAutoTUnref<GrTexture> dummyTexture2(this->createTexture(dummyDesc, NULL, 0));
 
+    if (!dummyTexture1 || ! dummyTexture2) {
+        return false;
+    }
+
     static const int NUM_TESTS = 512;
 
     SkRandom random;
     for (int t = 0; t < NUM_TESTS; ++t) {
 
 #if 0
         GrPrintf("\nTest Program %d\n-------------\n", t);
         static const int stop = -1;
         if (t == stop) {
             int breakpointhere = 9;
@@ skipping 113 matching lines @@
         SkRect::MakeWH(SK_Scalar1, SK_Scalar1), SK_Scalar1));
     GrConfigConversionEffect::Create(NULL,
                                      false,
                                      GrConfigConversionEffect::kNone_PMConversion,
                                      SkMatrix::I());
     SkScalar matrix[20];
     SkAutoTUnref<SkColorMatrixFilter> cmf(SkColorMatrixFilter::Create(matrix));
 }
 
 #endif