Move SkGLContext and some GrGLInterface implementations to skgputest module

tests/GrPorterDuffTest.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.
  */
 
 #include "SkXfermode.h"
 #include "Test.h"
 
@@ skipping 1129 matching lines @@
     xp->getOptimizations(opts, false, &overrideColor, caps);
 
     GrXferProcessor::BlendInfo blendInfo;
     xp->getBlendInfo(&blendInfo);
     TEST_ASSERT(blendInfo.fWriteColor);
 }
 
 DEF_GPUTEST(PorterDuffNoDualSourceBlending, reporter, /*factory*/) {
     GrContextOptions opts;
     opts.fSuppressDualSourceBlending = true;
-    GrContextFactory mockFactory(opts);
-    GrContext* ctx = mockFactory.get(GrContextFactory::kNull_GLContextType);
+    sk_gpu_test::GrContextFactory mockFactory(opts);
+    GrContext* ctx = mockFactory.get(sk_gpu_test::GrContextFactory::kNull_GLContextType);
     if (!ctx) {
         SkFAIL("Failed to create null context without ARB_blend_func_extended.");
         return;
     }
 
     const GrCaps& caps = *ctx->caps();
     if (caps.shaderCaps()->dualSourceBlendingSupport()) {
         SkFAIL("Null context failed to honor request for no ARB_blend_func_extended.");
         return;
     }
@@ skipping 48 matching lines @@
                 TEST_ASSERT(!xp->hasSecondaryOutput());
                 xp->getOptimizations(optimizations, false, 0, caps);
                 TEST_ASSERT(!xp->hasSecondaryOutput());
             }
         }
     }
     ctx->getGpu()->deleteTestingOnlyBackendTexture(backendTex);
 }
 
 #endif