Don't enforce available commands when connected to legacy session app

This change removes the check for available commands in `sendCustomCommand` of `MediaBrowserImplLegacy.java`. This is in parity with the behavior of legacy controllers/browsers when connected to a legacy app.

The test `sendCustomCommandWithMediaItem_commandButtonNotAvailable_permissionDenied` was updated to reflect this change.

PiperOrigin-RevId: 780580897
(cherry picked from commit 3174a48)

Author: marcbaechinger

RELEASENOTES.md

@@ -2,6 +2,16 @@
 
 ## 1.8
 
+### 1.8.0-rc02 (2025-07-23)
+
+This release includes the following changes since the
+[1.8.0-rc01 release](#180-rc01-2025-07-16):
+
+*   Session:
+    *   Remove check for available commands when sending custom commands to a
+        legacy `MediaBrowserServiceCompat`. This is in parity with the behavior
+        of legacy controllers/browsers when connected to a legacy app.
+
 ### 1.8.0-rc01 (2025-07-16)
 
 This release includes the following changes since the

libraries/session/src/main/java/androidx/media3/session/MediaBrowserImplLegacy.java

@@ -43,7 +43,6 @@
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
-import java.util.Objects;
 import org.checkerframework.checker.initialization.qual.UnderInitialization;
 
 /** Implementation of MediaBrowser with the {@link MediaBrowserCompat} for legacy support. */
@@ -374,9 +373,7 @@ public void onError(String query, @Nullable Bundle extrasSent) {
   @Override
   public ListenableFuture<SessionResult> sendCustomCommand(SessionCommand command, Bundle args) {
     MediaBrowserCompat browserCompat = getBrowserCompat();
-    if (browserCompat != null
-        && (instance.isSessionCommandAvailable(command)
-            || isContainedInCommandButtonsForMediaItems(command))) {
+    if (browserCompat != null) {
       SettableFuture<SessionResult> settable = SettableFuture.create();
       browserCompat.sendCustomAction(
           command.customAction,
@@ -402,19 +399,6 @@ public void onError(String action, @Nullable Bundle extras, @Nullable Bundle dat
     return Futures.immediateFuture(new SessionResult(SessionResult.RESULT_ERROR_PERMISSION_DENIED));
   }
 
-  // Using this method as a proxy whether an browser is allowed to send a custom action can be
-  // justified because a MediaBrowserCompat can declare the custom browse actions in onGetRoot()
-  // specifically for each browser that connects. This is different to Media3 where the command
-  // buttons for media items are declared on the session level, and are constraint by the available
-  // session commands granted individually to a controller/browser in onConnect.
-  private boolean isContainedInCommandButtonsForMediaItems(SessionCommand command) {
-    if (command.commandCode != SessionCommand.COMMAND_CODE_CUSTOM) {
-      return false;
-    }
-    CommandButton commandButton = commandButtonsForMediaItems.get(command.customAction);
-    return commandButton != null && Objects.equals(commandButton.sessionCommand, command);
-  }
-
   private MediaBrowserCompat getBrowserCompat(LibraryParams extras) {
     return browserCompats.get(extras);
   }

libraries/test_session_current/src/androidTest/java/androidx/media3/session/MediaBrowserListenerWithMediaBrowserServiceCompatTest.java

@@ -283,8 +283,7 @@ public void sendCustomCommandWithMediaItem_mediaItemIdConvertedCorrectly() throw
   }
 
   @Test
-  public void sendCustomCommandWithMediaItem_commandButtonNotAvailable_permissionDenied()
-      throws Exception {
+  public void sendCustomCommandWithMediaItem_commandButtonNotAvailable_succeeds() throws Exception {
     remoteService.setProxyForTest(TEST_MEDIA_ITEMS_WITH_BROWSE_ACTIONS);
     MediaBrowser mediaBrowser =
         createBrowser(
@@ -312,7 +311,7 @@ public void sendCustomCommandWithMediaItem_commandButtonNotAvailable_permissionD
                         /* args= */ Bundle.EMPTY))
             .get(TIMEOUT_MS, MILLISECONDS);
 
-    assertThat(sessionResult.resultCode).isEqualTo(SessionResult.RESULT_ERROR_PERMISSION_DENIED);
+    assertThat(sessionResult.resultCode).isEqualTo(SessionResult.RESULT_SUCCESS);
   }
 
   @Test