Revert of Move SkGLContext and some GrGLInterface implementations to skgputest module

src/gpu/gl/mesa/SkMesaGLContext.h

Index: src/gpu/gl/mesa/SkMesaGLContext.h
diff --git a/src/gpu/gl/mesa/SkMesaGLContext.h b/src/gpu/gl/mesa/SkMesaGLContext.h
new file mode 100644
index 0000000000000000000000000000000000000000..7f700b65367cd548d5cade6c191c8ac659f8a422
--- /dev/null
+++ b/src/gpu/gl/mesa/SkMesaGLContext.h
@@ -0,0 +1,44 @@
+/*
+ * 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 SkMesaGLContext_DEFINED
+#define SkMesaGLContext_DEFINED
+
+#include "gl/SkGLContext.h"
+
+#if SK_MESA
+
+class SkMesaGLContext : public SkGLContext {
+private:
+    typedef intptr_t Context;
+
+public:
+    ~SkMesaGLContext() override;
+
+    static SkMesaGLContext* Create() {
+        SkMesaGLContext* ctx = new SkMesaGLContext;
+        if (!ctx->isValid()) {
+            delete ctx;
+            return nullptr;
+        }
+        return ctx;
+    }
+
+private:
+    SkMesaGLContext();
+    void destroyGLContext();
+
+    void onPlatformMakeCurrent() const override;
+    void onPlatformSwapBuffers() const override;
+    GrGLFuncPtr onPlatformGetProcAddress(const char*) const override;
+
+    Context fContext;
+    GrGLubyte *fImage;
+};
+
+#endif
+
+#endif