Disallow modifying USB in Settings

Background
* The admin can disable signaling over USB
  on corporate owned device.

Changes
* If the admin has disabled signaling over
  USB, disable preferences in Settings to
  modify USB.
* Show policy transparency dialogs.

Manual Testing:
* Install TestDPC
* Set up as Device Owner
* Disable USB data signaling
* Verify Settings > Connected Devices
  > USB is disabled
* Verify Settings > Network & Internet
  > Hotspot & tethering > USB tethering
  is disabled
* Verify Developer options >
  USB debugging, default USB configurations
  and USB audio routing are disabled

Bug: 168301639
Test: Manual Testing
      make RunSettingsRoboTests -j ROBOTEST_FILTER=TetherSettingsTest
      make RunSettingsRoboTests -j
      ROBOTEST_FILTER=UsbAudioRoutingPreferenceControllerTest
      make RunSettingsRoboTests -j
      ROBOTEST_FILTER=UsbDefaultFragmentTest
      make RunSettingsRoboTests -j
      ROBOTEST_FILTER=DevelopmentSettingsDashboardFragmentTest
      make RunSettingsRoboTests -j
      ROBOTEST_FILTER=DefaultUsbConfigurationPreferenceControllerTest
      make RunSettingsLibRoboTests -j
      ROBOTEST_FILTER=EnableAdbPreferenceControllerTest

Change-Id: I3e8461ac37f406a407c874598335cde28fb89b2d
Merged-In: I3e8461ac37f406a407c874598335cde28fb89b2d

src/com/android/settings/connecteddevice/usb/ConnectedUsbDeviceUpdater.java

@@ -19,8 +19,11 @@ import static android.hardware.usb.UsbPortStatus.DATA_ROLE_DEVICE;
 import static android.hardware.usb.UsbPortStatus.POWER_ROLE_SINK;
 import static android.hardware.usb.UsbPortStatus.POWER_ROLE_SOURCE;
 
+import static com.android.settingslib.RestrictedLockUtilsInternal.checkIfUsbDataSignalingIsDisabled;
+
 import android.content.Context;
 import android.hardware.usb.UsbManager;
+import android.os.UserHandle;
 
 import androidx.annotation.VisibleForTesting;
 import androidx.preference.Preference;
@@ -30,6 +33,7 @@ import com.android.settings.connecteddevice.DevicePreferenceCallback;
 import com.android.settings.core.SubSettingLauncher;
 import com.android.settings.dashboard.DashboardFragment;
 import com.android.settings.overlay.FeatureFactory;
+import com.android.settingslib.RestrictedPreference;
 import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
 
 /**
@@ -45,7 +49,7 @@ public class ConnectedUsbDeviceUpdater {
     private UsbBackend mUsbBackend;
     private DevicePreferenceCallback mDevicePreferenceCallback;
     @VisibleForTesting
-    Preference mUsbPreference;
+    RestrictedPreference mUsbPreference;
     @VisibleForTesting
     UsbConnectionBroadcastReceiver mUsbReceiver;
 
@@ -88,10 +92,12 @@ public class ConnectedUsbDeviceUpdater {
     }
 
     public void initUsbPreference(Context context) {
-        mUsbPreference = new Preference(context, null /* AttributeSet */);
+        mUsbPreference = new RestrictedPreference(context, null /* AttributeSet */);
         mUsbPreference.setTitle(R.string.usb_pref);
         mUsbPreference.setIcon(R.drawable.ic_usb);
         mUsbPreference.setKey(PREF_KEY);
+        mUsbPreference.setDisabledByAdmin(
+                checkIfUsbDataSignalingIsDisabled(context, UserHandle.myUserId()));
         mUsbPreference.setOnPreferenceClickListener((Preference p) -> {
             mMetricsFeatureProvider.logClickedPreference(p, mFragment.getMetricsCategory());
             // New version - uses a separate screen.

src/com/android/settings/connecteddevice/usb/UsbDetailsFragment.java

@@ -16,9 +16,12 @@
 
 package com.android.settings.connecteddevice.usb;
 
+import static com.android.settingslib.RestrictedLockUtilsInternal.checkIfUsbDataSignalingIsDisabled;
+
 import android.app.settings.SettingsEnums;
 import android.content.Context;
 import android.os.Bundle;
+import android.os.UserHandle;
 import android.view.View;
 
 import androidx.annotation.VisibleForTesting;
@@ -101,6 +104,11 @@ public class UsbDetailsFragment extends DashboardFragment {
      */
     public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
             new BaseSearchIndexProvider(R.xml.usb_details_fragment) {
+                @Override
+                protected boolean isPageSearchEnabled(Context context) {
+                    return checkIfUsbDataSignalingIsDisabled(
+                            context, UserHandle.myUserId()) != null;
+                }
 
                 @Override
                 public List<AbstractPreferenceController> createPreferenceControllers(