Cleaning up apu/ and renaming -private files to _flags.

Part of #296.

src/xenia/gpu/gpu_flags.cc

@@ -0,0 +1,21 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2013 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/gpu/gpu_flags.h"
+
+DEFINE_string(gpu, "any", "Graphics system. Use: [any, gl4]");
+
+DEFINE_string(trace_gpu_prefix, "scratch/gpu/gpu_trace_",
+              "Prefix path for GPU trace files.");
+DEFINE_bool(trace_gpu_stream, false, "Trace all GPU packets.");
+
+DEFINE_string(dump_shaders, "",
+              "Path to write GPU shaders to as they are compiled.");
+
+DEFINE_bool(vsync, true, "Enable VSYNC.");