Add a Global setting for disabling OEM unlocking setting

+ By default, OEM unlocking setting is enabled.
+ Add a check to prevent oem unlock being flipped if the setting isn't
  enabled.

Bug: 28163088
Change-Id: I087d8d5a1d99a611a8f66ff71a92ec9ea1da4e9f
diff --git a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java
index 8dc247a..7871fe3 100644
--- a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java
+++ b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java
@@ -1942,7 +1942,7 @@
         }
 
         private final class UpgradeController {
-            private static final int SETTINGS_VERSION = 127;
+            private static final int SETTINGS_VERSION = 128;
 
             private final int mUserId;
 
@@ -2197,6 +2197,18 @@
                     currentVersion = 127;
                 }
 
+                if (currentVersion == 127) {
+                    // Version 127: Disable OEM unlock setting by default on some devices.
+                    final SettingsState globalSettings = getGlobalSettingsLocked();
+                    String defaultOemUnlockDisabled = (getContext().getResources()
+                            .getBoolean(R.bool.def_oem_unlock_disallow) ? "1" : "0");
+                    globalSettings.insertSettingLocked(
+                            Settings.Global.OEM_UNLOCK_DISALLOWED,
+                            defaultOemUnlockDisabled,
+                            SettingsState.SYSTEM_PACKAGE_NAME);
+                    currentVersion = 128;
+                }
+
                 // vXXX: Add new settings above this point.
 
                 // Return the current version.