Rename userId related variables in MediaRouter2ServiceImpl

The new names better reflect that the userId corresponds to the caller
and not the target router.

This is a non-functional change.

Bug: 288580225
Test: Presubmit.
Change-Id: Iaf0f1ae65504fdb6313a5585d43023fb7fb24d28
diff --git a/services/core/java/com/android/server/media/MediaRouter2ServiceImpl.java b/services/core/java/com/android/server/media/MediaRouter2ServiceImpl.java
index 4892c22..83a3125 100644
--- a/services/core/java/com/android/server/media/MediaRouter2ServiceImpl.java
+++ b/services/core/java/com/android/server/media/MediaRouter2ServiceImpl.java
@@ -22,6 +22,7 @@
 import static android.media.MediaRoute2ProviderService.REASON_UNKNOWN_ERROR;
 import static android.media.MediaRouter2Utils.getOriginalId;
 import static android.media.MediaRouter2Utils.getProviderId;
+
 import static com.android.internal.util.function.pooled.PooledLambda.obtainMessage;
 import static com.android.server.media.MediaFeatureFlagManager.FEATURE_SCANNING_MINIMUM_PACKAGE_IMPORTANCE;
 
@@ -487,12 +488,13 @@
 
         final int callerUid = Binder.getCallingUid();
         final int callerPid = Binder.getCallingPid();
-        final int userId = UserHandle.getUserHandleForUid(callerUid).getIdentifier();
+        final int callerUserId = UserHandle.getUserHandleForUid(callerUid).getIdentifier();
 
         final long token = Binder.clearCallingIdentity();
         try {
             synchronized (mLock) {
-                registerManagerLocked(manager, callerUid, callerPid, callerPackageName, userId);
+                registerManagerLocked(
+                        manager, callerUid, callerPid, callerPackageName, callerUserId);
             }
         } finally {
             Binder.restoreCallingIdentity(token);
@@ -1156,8 +1158,12 @@
     }
 
     @GuardedBy("mLock")
-    private void registerManagerLocked(@NonNull IMediaRouter2Manager manager,
-            int callerUid, int callerPid, @NonNull String callerPackageName, int userId) {
+    private void registerManagerLocked(
+            @NonNull IMediaRouter2Manager manager,
+            int callerUid,
+            int callerPid,
+            @NonNull String callerPackageName,
+            int callerUserId) {
         final IBinder binder = manager.asBinder();
         ManagerRecord managerRecord = mAllManagerRecords.get(binder);
 
@@ -1167,14 +1173,17 @@
             return;
         }
 
-        Slog.i(TAG, TextUtils.formatSimple(
-                "registerManager | callerUid: %d, callerPid: %d, package: %s, user: %d",
-                callerUid, callerPid, callerPackageName, userId));
+        Slog.i(
+                TAG,
+                TextUtils.formatSimple(
+                        "registerManager | callerUid: %d, callerPid: %d, callerPackage: %s,"
+                            + " callerUserId: %d",
+                        callerUid, callerPid, callerPackageName, callerUserId));
 
         mContext.enforcePermission(Manifest.permission.MEDIA_CONTENT_CONTROL, callerPid, callerUid,
                 "Must hold MEDIA_CONTENT_CONTROL permission.");
 
-        UserRecord userRecord = getOrCreateUserRecordLocked(userId);
+        UserRecord userRecord = getOrCreateUserRecordLocked(callerUserId);
         managerRecord = new ManagerRecord(
                 userRecord, manager, callerUid, callerPid, callerPackageName);
         try {