Fix alpha textures in NV ES3 contexts on Windows

src/gpu/gl/GrGLUtil.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.
  */
 
 
 #include "GrGLUtil.h"
 #include "SkMatrix.h"
@@ skipping 201 matching lines @@
         }
         if (0 == strcmp(vendorString, "Imagination Technologies")) {
             return kImagination_GrGLVendor;
         }
         if (0 == strncmp(vendorString, "Intel ", 6) || 0 == strcmp(vendorString, "Intel")) {
             return kIntel_GrGLVendor;
         }
         if (0 == strcmp(vendorString, "Qualcomm")) {
             return kQualcomm_GrGLVendor;
         }
+        if (0 == strcmp(vendorString, "NVIDIA Corporation")) {
+                return kNVIDIA_GrGLVendor;
+        }
     }
     return kOther_GrGLVendor;
 }
 
 GrGLRenderer GrGLGetRendererFromString(const char* rendererString) {
     if (NULL != rendererString) {
         if (0 == strcmp(rendererString, "NVIDIA Tegra 3")) {
             return kTegra3_GrGLRenderer;
         } else if (0 == strcmp(rendererString, "NVIDIA Tegra")) {
             return kTegra2_GrGLRenderer;
@@ skipping 61 matching lines @@
     dest[9]  = 0;
     dest[10] = 1;
     dest[11] = 0;
 
     // Col 3
     dest[12] = SkScalarToFloat(src[SkMatrix::kMTransX]);
     dest[13] = SkScalarToFloat(src[SkMatrix::kMTransY]);
     dest[14] = 0;
     dest[15] = SkScalarToFloat(src[SkMatrix::kMPersp2]);
 }