Move SkGLContext and some GrGLInterface implementations to skgputest module

src/gpu/gl/debug/GrTextureUnitObj.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.
- */
-
-#include "GrTextureUnitObj.h"
-#include "GrTextureObj.h"
-
-void GrTextureUnitObj::setTexture(GrTextureObj *texture)  {
-
-    if (fTexture) {
-        GrAlwaysAssert(fTexture->getBound(this));
-        fTexture->resetBound(this);
-
-        GrAlwaysAssert(!fTexture->getDeleted());
-        fTexture->unref();
-    }
-
-    fTexture = texture;
-
-    if (fTexture) {
-        GrAlwaysAssert(!fTexture->getDeleted());
-        fTexture->ref();
-
-        GrAlwaysAssert(!fTexture->getBound(this));
-        fTexture->setBound(this);
-    }
-}