Move GL interface code out of the OpenGL video backend.

Source/Core/Common/GL/GLInterface/AGL.h

@@ -0,0 +1,27 @@
+// Copyright 2008 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#ifdef __APPLE__
+#import <AppKit/AppKit.h>
+#endif
+
+#include "Common/GL/GLInterfaceBase.h"
+
+class cInterfaceAGL : public cInterfaceBase
+{
+private:
+	NSView *cocoaWin;
+	NSOpenGLContext *cocoaCtx;
+public:
+	void Swap();
+	bool Create(void *window_handle, bool core);
+	bool MakeCurrent();
+	bool ClearCurrent();
+	void Shutdown();
+	void Update();
+	void SwapInterval(int interval);
+
+};