Disable USB debugging checkbox and backup password for secondary users

This prevents secondary users from turning on adb debugging, even if they
find a way to launch developer options. Similarly, don't let them add or
change the adb backup password.

Bug: 7637920
Change-Id: I297f0c515a276ede6a7f12d2add72faec4eeb384

src/com/android/settings/DevelopmentSettings.java

@@ -46,6 +46,7 @@ import android.os.ServiceManager;
 import android.os.StrictMode;
 import android.os.SystemProperties;
 import android.os.Trace;
+import android.os.UserHandle;
 import android.preference.CheckBoxPreference;
 import android.preference.ListPreference;
 import android.preference.MultiCheckPreference;
@@ -213,6 +214,11 @@ public class DevelopmentSettings extends PreferenceFragment
         mPassword = (PreferenceScreen) findPreference(LOCAL_BACKUP_PASSWORD);
         mAllPrefs.add(mPassword);
 
+        if (!android.os.Process.myUserHandle().equals(UserHandle.OWNER)) {
+            disableForUser(mEnableAdb);
+            disableForUser(mPassword);
+        }
+
         mDebugAppPref = findPreference(DEBUG_APP_KEY);
         mAllPrefs.add(mDebugAppPref);
         mWaitForDebugger = findAndInitCheckboxPref(WAIT_FOR_DEBUGGER_KEY);
@@ -284,6 +290,13 @@ public class DevelopmentSettings extends PreferenceFragment
         removeHdcpOptionsForProduction();
     }
 
+    private void disableForUser(Preference pref) {
+        if (pref != null) {
+            pref.setEnabled(false);
+            mDisabledPrefs.add(pref);
+        }
+    }
+
     private CheckBoxPreference findAndInitCheckboxPref(String key) {
         CheckBoxPreference pref = (CheckBoxPreference) findPreference(key);
         if (pref == null) {