Move SkGLContext and some GrGLInterface implementations to skgputest module

src/gpu/gl/nacl/SkCreatePlatformGLContext_nacl.cpp

Index: src/gpu/gl/nacl/SkCreatePlatformGLContext_nacl.cpp
diff --git a/src/gpu/gl/nacl/SkCreatePlatformGLContext_nacl.cpp b/src/gpu/gl/nacl/SkCreatePlatformGLContext_nacl.cpp
deleted file mode 100644
index 855f0dc1245ad7406f6862d1ca9dbe77461a907c..0000000000000000000000000000000000000000
--- a/src/gpu/gl/nacl/SkCreatePlatformGLContext_nacl.cpp
+++ /dev/null
@@ -1,12 +0,0 @@
-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#include "gl/SkGLContext.h"
-
-SkGLContext* SkCreatePlatformGLContext(GrGLStandard forcedGpuAPI, SkGLContext* shareContext) {
-    SkASSERT(!shareContext);
-    return nullptr;
-}