[a11y] Getting accessibility focus at pop up icon

When pop up icon is shown on the TTT receiver, the talkback says the name of the app playing.

Bug: 229561308
Test: Checked that Talkback says the icon name whenever we execute an adb command that pops up the icon.
Change-Id: I369999143488d5486c4e2c508ac182b870468765

packages/SystemUI/src/com/android/systemui/media/taptotransfer/common/MediaTttChipControllerCommon.kt

@@ -226,7 +226,7 @@ abstract class MediaTttChipControllerCommon<T : ChipInfoCommon>(
 
         appIconView.contentDescription = appNameOverride ?: iconInfo.iconName
         appIconView.setImageDrawable(appIconDrawableOverride ?: iconInfo.icon)
-        return appIconView.contentDescription.toString()
+        return appIconView.contentDescription
     }
 
     /**

packages/SystemUI/src/com/android/systemui/media/taptotransfer/receiver/MediaTttChipControllerReceiver.kt

@@ -141,12 +141,13 @@ class MediaTttChipControllerReceiver @Inject constructor(
 
     override fun updateChipView(newChipInfo: ChipReceiverInfo, currentChipView: ViewGroup) {
         super.updateChipView(newChipInfo, currentChipView)
-        setIcon(
+        val iconName = setIcon(
                 currentChipView,
                 newChipInfo.routeInfo.clientPackageName,
                 newChipInfo.appIconDrawableOverride,
                 newChipInfo.appNameOverride
         )
+        currentChipView.contentDescription = iconName
     }
 
     override fun animateChipIn(chipView: ViewGroup) {
@@ -159,6 +160,8 @@ class MediaTttChipControllerReceiver @Inject constructor(
                 .alpha(1f)
                 .setDuration(5.frames)
                 .start()
+        // Using withEndAction{} doesn't apply a11y focus when screen is unlocked.
+        appIconView.postOnAnimation { chipView.requestAccessibilityFocus() }
         startRipple(chipView.requireViewById(R.id.ripple))
     }