VideoCommon: Scan texture dumping directory + subdirectories to not re-dump existing files.

Source/Core/VideoCommon/TextureUtils.h

@@ -4,6 +4,7 @@
 #pragma once
 
 #include <string>
+#include <unordered_set>
 
 #include "Common/CommonTypes.h"
 
@@ -11,6 +12,18 @@ class AbstractTexture;
 
 namespace VideoCommon::TextureUtils
 {
+class TextureDumper
+{
+public:
+  // Only dumps if texture did not already exist anywhere within the dump-textures path.
+  void DumpTexture(const ::AbstractTexture& texture, std::string basename, u32 level,
+                   bool is_arbitrary);
+
+private:
+  std::unordered_set<std::string> m_dumped_textures;
+};
+
 void DumpTexture(const ::AbstractTexture& texture, std::string basename, u32 level,
                  bool is_arbitrary);
-}
+
+}  // namespace VideoCommon::TextureUtils