Revert of Move SkGLContext and some GrGLInterface implementations to skgputest module

src/gpu/gl/debug/SkDebugGLContext.h

Index: src/gpu/gl/debug/SkDebugGLContext.h
diff --git a/src/gpu/gl/debug/SkDebugGLContext.h b/src/gpu/gl/debug/SkDebugGLContext.h
new file mode 100644
index 0000000000000000000000000000000000000000..1ea7b62931cd01dc83c1a9d9858fe677d95b76e0
--- /dev/null
+++ b/src/gpu/gl/debug/SkDebugGLContext.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#ifndef SkDebugGLContext_DEFINED
+#define SkDebugGLContext_DEFINED
+
+#include "gl/SkGLContext.h"
+
+class SkDebugGLContext : public SkGLContext {
+public:
+    ~SkDebugGLContext() override;
+
+    static SkDebugGLContext* Create() {
+        return new SkDebugGLContext;
+    }
+private:
+    void onPlatformMakeCurrent() const override {}
+    void onPlatformSwapBuffers() const override {}
+    GrGLFuncPtr onPlatformGetProcAddress(const char*) const override { return nullptr; }
+
+    SkDebugGLContext();
+};
+
+#endif