Move SkGLContext and some GrGLInterface implementations to skgputest module

src/gpu/GrTest.h

-/*
- * Copyright 2013 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef GrTest_DEFINED
-#define GrTest_DEFINED
-
-#include "GrContext.h"
-#include "GrDrawTarget.h"
-#include "gl/GrGLContext.h"
-
-namespace GrTest {
-    /**
-     * Forces the GrContext to use a small atlas which only has room for one plot and will thus
-     * constantly be evicting entries
-     */
-    void SetupAlwaysEvictAtlas(GrContext*);
-};
-
-/** TODO Please do not use this if you can avoid it.  We are in the process of deleting it.
-    Allows a test to temporarily draw to a GrDrawTarget owned by a GrContext. Tests that use this
-    should be careful not to mix using the GrDrawTarget directly and drawing via SkCanvas or
-    GrContext. In the future this object may provide some guards to prevent this. */
-class GrTestTarget {
-public:
-    GrTestTarget() {};
-
-    void init(GrContext*, GrDrawTarget*, GrRenderTarget*);
-
-    GrDrawTarget* target() { return fDrawTarget.get(); }
-    GrResourceProvider* resourceProvider() { return fContext->resourceProvider(); }
-
-private:
-    SkAutoTUnref<GrContext>                 fContext;
-    SkAutoTUnref<GrDrawTarget>              fDrawTarget;
-    SkAutoTUnref<GrRenderTarget>            fRenderTarget;
-};
-
-#endif