Move debug_manager_state_restore.h to core.

Change-Id: I3ef4a1aec40efa4bbc8346a5b517336c42c06519
Signed-off-by: Mrozek, Michal <michal.mrozek@intel.com>

core/unit_tests/helpers/debug_manager_state_restore.h

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2017-2019 Intel Corporation
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+#pragma once
+#include "runtime/os_interface/debug_settings_manager.h"
+#include "runtime/utilities/debug_settings_reader.h"
+
+using namespace NEO;
+
+class DebugManagerStateRestore {
+  public:
+    DebugManagerStateRestore() {
+        debugVarSnapshot = DebugManager.flags;
+        injectFcnSnapshot = DebugManager.injectFcn;
+    }
+    ~DebugManagerStateRestore() {
+        DebugManager.flags = debugVarSnapshot;
+        DebugManager.injectFcn = injectFcnSnapshot;
+#undef DECLARE_DEBUG_VARIABLE
+#define DECLARE_DEBUG_VARIABLE(dataType, variableName, defaultValue, description) shrink(DebugManager.flags.variableName.getRef());
+#include "debug_variables.inl"
+#undef DECLARE_DEBUG_VARIABLE
+    }
+    DebugVariables debugVarSnapshot;
+    void *injectFcnSnapshot = nullptr;
+
+  protected:
+    void shrink(std::string &flag) {
+        flag.shrink_to_fit();
+    }
+    void shrink(int32_t &flag) {}
+    void shrink(bool &flag) {}
+};
+
+class RegistryReaderMock : public SettingsReader {
+  public:
+    RegistryReaderMock() {}
+    ~RegistryReaderMock() {}
+
+    unsigned int forceRetValue = 1;
+
+    int32_t getSetting(const char *settingName, int32_t defaultValue) override {
+        return static_cast<int32_t>(forceRetValue);
+    }
+    bool getSetting(const char *settingName, bool defaultValue) override {
+        return true;
+    }
+
+    std::string getSetting(const char *settingName, const std::string &value) override {
+        return "";
+    }
+    const char *appSpecificLocation(const std::string &name) override {
+        return name.c_str();
+    }
+};