rename sk_gpu_test::GLContext to sk_gpu_test::GLTestContext

rename subclasses

Fix up the EGL native GLTestContext
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1849463002

TBR=jvanverth@google.com

Committed: https://skia.googlesource.com/skia/+/4c7f0a16312c374eba4e8d5d46435ce9eb0b9971

Review URL: https://codereview.chromium.org/1849463002
diff --git a/tools/gpu/gl/null/NullGLTestContext.h b/tools/gpu/gl/null/NullGLTestContext.h
new file mode 100644
index 0000000..ebde61a
--- /dev/null
+++ b/tools/gpu/gl/null/NullGLTestContext.h
@@ -0,0 +1,17 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#ifndef NullGLContext_DEFINED
+#define NullGLContext_DEFINED
+
+#include "gl/GLTestContext.h"
+
+namespace sk_gpu_test {
+GLTestContext* CreateNullGLTestContext();
+}  // namespace sk_gpu_test
+
+#endif