[GPU] Store an EDRAM snapshot in traces

src/xenia/gpu/null/null_command_processor.cc

@@ -21,6 +21,8 @@ NullCommandProcessor::~NullCommandProcessor() = default;
 void NullCommandProcessor::TracePlaybackWroteMemory(uint32_t base_ptr,
                                                     uint32_t length) {}
 
+void NullCommandProcessor::RestoreEDRAMSnapshot(const void* snapshot) {}
+
 bool NullCommandProcessor::SetupContext() {
   return CommandProcessor::SetupContext();
 }