Support using OpenGL ES context on desktop

tests/ReadWriteAlphaTest.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This test is specific to the GPU backend.
 #if SK_SUPPORT_GPU && !defined(SK_BUILD_FOR_ANDROID)
 
 #include "GrContextFactory.h"
 #include "SkGpuDevice.h"
 #include "Test.h"
 
 static const int X_SIZE = 12;
 static const int Y_SIZE = 12;
 
 DEF_GPUTEST(ReadWriteAlpha, reporter, factory) {
     for (int type = 0; type < GrContextFactory::kLastGLContextType; ++type) {
         GrContextFactory::GLContextType glType = static_cast<GrContextFactory::GLContextType>(type);
         if (!GrContextFactory::IsRenderingGLContext(glType)) {
             continue;
         }
-        GrContext* context = factory->get(glType);
+        GrContext* context = factory->get(glType, kNone_GrGLStandard);
         if (NULL == context) {
             continue;
         }
 
         unsigned char textureData[X_SIZE][Y_SIZE];
 
         memset(textureData, 0, X_SIZE * Y_SIZE);
 
         GrTextureDesc desc;
 
@@ skipping 68 matching lines @@
                     match = false;
                 }
             }
         }
 
         REPORTER_ASSERT(reporter, match);
     }
 }
 
 #endif