DeviceInfo: Wrap prefereces in PreferenceController

Bug: 34774945
Test: make RunSettingsRoboTests
Change-Id: I8bf56b436064684f4d2010e6899548249af69fc3

src/com/android/settings/deviceinfo/SafetyLegalPreferenceController.java

@@ -0,0 +1,28 @@
+package com.android.settings.deviceinfo;
+
+import android.content.Context;
+import android.os.SystemProperties;
+import android.text.TextUtils;
+
+import com.android.settings.core.PreferenceController;
+
+public class SafetyLegalPreferenceController extends PreferenceController {
+
+    private static final String KEY_SAFETY_LEGAL = "safetylegal";
+    private static final String PROPERTY_URL_SAFETYLEGAL = "ro.url.safetylegal";
+
+
+    public SafetyLegalPreferenceController(Context context) {
+        super(context);
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return !TextUtils.isEmpty(SystemProperties.get(PROPERTY_URL_SAFETYLEGAL));
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_SAFETY_LEGAL;
+    }
+}