Fix Vulkan tests after GrContextFactory move to sk_gpu_test

tests/VkUploadPixelsTests.cpp

 /*
  * Copyright 2015 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
 
 #include "SkTypes.h"
 
 #if SK_SUPPORT_GPU && SK_ALLOW_STATIC_GLOBAL_INITIALIZERS && defined(SK_VULKAN)
 
 #include "GrContextFactory.h"
 #include "GrTest.h"
 #include "Test.h"
 #include "vk/GrVkGpu.h"
 
+using sk_gpu_test::GrContextFactory;
 
 void fill_pixel_data(int width, int height, GrColor* data) {
 
     // build red-green gradient
     for (int j = 0; j < height; ++j) {
         for (int i = 0; i < width; ++i) {
             unsigned int red = (unsigned int)(256.f*(i / (float)width));
             unsigned int green = (unsigned int)(256.f*(j / (float)height));
             data[i + j*width] = GrColorPackRGBA(red - (red>>8), green - (green>>8), 0xff, 0xff);
         }
@@ skipping 121 matching lines @@
             basic_texture_test(reporter, context, kBGRA_8888_GrPixelConfig, false, false);
             basic_texture_test(reporter, context, kBGRA_8888_GrPixelConfig, true, false);
             basic_texture_test(reporter, context, kBGRA_8888_GrPixelConfig, false, true);
             basic_texture_test(reporter, context, kBGRA_8888_GrPixelConfig, true, true);
         }
 
     }
 }
 
 #endif