Use group icon in device chip for group routing sessions

This change extends ag/27342016 by also overriding the icon when the
number of selected routes is greater than one. In which case we use the
group icon.

Note: This issue was not caused by ag/27342016. But it's also unclear
when it was introduced.

Bug: b/288915598
Test: Manually using music playing apps.
Flag: com.android.settingslib.media.flags.use_playback_info_for_routing_controls
Change-Id: Ic7a15362f7ed51ee1b1da40ee4c30722d1e7f7b3
diff --git a/packages/SystemUI/src/com/android/systemui/media/controls/domain/pipeline/MediaDeviceManager.kt b/packages/SystemUI/src/com/android/systemui/media/controls/domain/pipeline/MediaDeviceManager.kt
index 8b2f619..eab0d48 100644
--- a/packages/SystemUI/src/com/android/systemui/media/controls/domain/pipeline/MediaDeviceManager.kt
+++ b/packages/SystemUI/src/com/android/systemui/media/controls/domain/pipeline/MediaDeviceManager.kt
@@ -354,10 +354,21 @@
 
                     activeDevice =
                         routingSession?.let {
+                            val icon = if (it.selectedRoutes.size > 1) {
+                                context.getDrawable(
+                                        com.android.settingslib.R.drawable.ic_media_group_device)
+                            } else {
+                                connectedDevice?.icon // Single route. We don't change the icon.
+                            }
                             // For a remote session, always use the current device from
-                            // LocalMediaManager. Override with routing session name if available to
-                            // show dynamic group name.
-                            connectedDevice?.copy(name = it.name ?: connectedDevice.name)
+                            // LocalMediaManager. Override with routing session information if
+                            // available:
+                            //   - Name: To show the dynamic group name.
+                            //   - Icon: To show the group icon if there's more than one selected
+                            //           route.
+                            connectedDevice?.copy(
+                                    name = it.name ?: connectedDevice.name,
+                                    icon = icon)
                         } ?: MediaDeviceData(
                             enabled = false,
                             icon = context.getDrawable(R.drawable.ic_media_home_devices),