Add untested function Android_ComputeRecursiveDirectorySize

UI/GameInfoCache.cpp

@@ -343,13 +343,11 @@ public:
 	void Run() override {
 		// An early-return will result in the destructor running, where we can set
 		// flags like working and pending.
-
 		if (!info_->LoadFromPath(gamePath_)) {
 			return;
 		}
 
 		// In case of a remote file, check if it actually exists before locking.
-		// This is likely not necessary at a
 		if (!info_->GetFileLoader()->Exists()) {
 			return;
 		}