Changing BluetoothHeadset APIs from @hide to @SystemApi

For isInbandringing API - it is used in the call journey and would
change the behavior(undeterministic) of the call if not used.

Stop/StartScoUsingVirtualVoiceCall is used in the BluetoothShim layer
specifically for testing and mocking in the Android Apps. Seems
reasonable to keep this as a SystemAPI given that it has no params and
unlikely to be changed.

Bug: 195160939
Tag: #feature
Test: Manual
Change-Id: I02b2e7e5e0be3b462f7c25b655e669e2c7fe47eb

core/api/system-current.txt

@@ -2017,7 +2017,10 @@ package android.bluetooth {
     method @RequiresPermission(allOf={android.Manifest.permission.BLUETOOTH_CONNECT, android.Manifest.permission.MODIFY_PHONE_STATE}) public boolean connect(android.bluetooth.BluetoothDevice);
     method @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT) public boolean disconnect(android.bluetooth.BluetoothDevice);
     method @RequiresPermission(allOf={android.Manifest.permission.BLUETOOTH_CONNECT, android.Manifest.permission.BLUETOOTH_PRIVILEGED}) public int getConnectionPolicy(@NonNull android.bluetooth.BluetoothDevice);
+    method @RequiresPermission(android.Manifest.permission.BLUETOOTH_PRIVILEGED) public boolean isInbandRingingEnabled();
     method @RequiresPermission(allOf={android.Manifest.permission.BLUETOOTH_CONNECT, android.Manifest.permission.BLUETOOTH_PRIVILEGED, android.Manifest.permission.MODIFY_PHONE_STATE}) public boolean setConnectionPolicy(@NonNull android.bluetooth.BluetoothDevice, int);
+    method @RequiresPermission(allOf={android.Manifest.permission.BLUETOOTH_CONNECT, android.Manifest.permission.MODIFY_PHONE_STATE}) public boolean startScoUsingVirtualVoiceCall();
+    method @RequiresPermission(allOf={android.Manifest.permission.BLUETOOTH_CONNECT, android.Manifest.permission.MODIFY_PHONE_STATE}) public boolean stopScoUsingVirtualVoiceCall();
   }
 
   public final class BluetoothHearingAid implements android.bluetooth.BluetoothProfile {

core/java/android/bluetooth/BluetoothHeadset.java

@@ -16,17 +16,16 @@
 
 package android.bluetooth;
 
-import android.Manifest;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.RequiresPermission;
 import android.annotation.SdkConstant;
-import android.annotation.SuppressLint;
 import android.annotation.SdkConstant.SdkConstantType;
+import android.annotation.SuppressLint;
+import android.annotation.SystemApi;
 import android.bluetooth.annotations.RequiresBluetoothConnectPermission;
 import android.bluetooth.annotations.RequiresLegacyBluetoothAdminPermission;
 import android.bluetooth.annotations.RequiresLegacyBluetoothPermission;
-import android.annotation.SystemApi;
 import android.compat.annotation.UnsupportedAppUsage;
 import android.content.Attributable;
 import android.content.AttributionSource;
@@ -1105,13 +1104,13 @@ public final class BluetoothHeadset implements BluetoothProfile {
      *  - binder is dead or Bluetooth is disabled or other error
      * @hide
      */
+    @SystemApi
     @RequiresLegacyBluetoothAdminPermission
     @RequiresBluetoothConnectPermission
     @RequiresPermission(allOf = {
             android.Manifest.permission.BLUETOOTH_CONNECT,
             android.Manifest.permission.MODIFY_PHONE_STATE,
     })
-    @UnsupportedAppUsage
     public boolean startScoUsingVirtualVoiceCall() {
         if (DBG) log("startScoUsingVirtualVoiceCall()");
         final IBluetoothHeadset service = mService;
@@ -1140,13 +1139,13 @@ public final class BluetoothHeadset implements BluetoothProfile {
      *  - binder is dead or Bluetooth is disabled or other error
      * @hide
      */
+    @SystemApi
     @RequiresLegacyBluetoothAdminPermission
     @RequiresBluetoothConnectPermission
     @RequiresPermission(allOf = {
             android.Manifest.permission.BLUETOOTH_CONNECT,
             android.Manifest.permission.MODIFY_PHONE_STATE,
     })
-    @UnsupportedAppUsage
     public boolean stopScoUsingVirtualVoiceCall() {
         if (DBG) log("stopScoUsingVirtualVoiceCall()");
         final IBluetoothHeadset service = mService;
@@ -1343,9 +1342,10 @@ public final class BluetoothHeadset implements BluetoothProfile {
      * @return true if in-band ringing is enabled, false if in-band ringing is disabled
      * @hide
      */
+    @SystemApi
     @RequiresLegacyBluetoothPermission
     @RequiresBluetoothConnectPermission
-    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_PRIVILEGED)
     public boolean isInbandRingingEnabled() {
         if (DBG) {
             log("isInbandRingingEnabled()");