Let apps see if their conversations have been demoted

Test: cts
Bug: 154140688
Change-Id: Ief3c2535f3f253e60470c63fde9325e06ceda484

api/current.txt

@@ -5957,6 +5957,7 @@ package android.app {
     method public long[] getVibrationPattern();
     method public boolean hasUserSetImportance();
     method public boolean hasUserSetSound();
+    method public boolean isDemoted();
     method public boolean isImportantConversation();
     method public void setAllowBubbles(boolean);
     method public void setBypassDnd(boolean);

api/test-current.txt

@@ -451,6 +451,7 @@ package android.app {
     method public void lockFields(int);
     method public void setBlockable(boolean);
     method public void setDeleted(boolean);
+    method public void setDemoted(boolean);
     method public void setFgServiceShown(boolean);
     method public void setImportanceLockedByCriticalDeviceFunction(boolean);
     method public void setImportanceLockedByOEM(boolean);
@@ -474,6 +475,7 @@ package android.app {
     method public boolean isNotificationAssistantAccessGranted(@NonNull android.content.ComponentName);
     method public boolean matchesCallFilter(android.os.Bundle);
     method public void setNotificationAssistantAccessGranted(@Nullable android.content.ComponentName, boolean);
+    method public void updateNotificationChannel(@NonNull String, int, @NonNull android.app.NotificationChannel);
   }
 
   public final class PictureInPictureParams implements android.os.Parcelable {

core/java/android/app/NotificationChannel.java

@@ -828,12 +828,15 @@ public final class NotificationChannel implements Parcelable {
     /**
      * @hide
      */
+    @TestApi
     public void setDemoted(boolean demoted) {
         mDemoted = demoted;
     }
 
     /**
-     * @hide
+     * Returns whether the user has decided that this channel does not represent a conversation. The
+     * value will always be false for channels that never claimed to be conversations - that is,
+     * for channels where {@link #getConversationId()} and {@link #getParentChannelId()} are empty.
      */
     public boolean isDemoted() {
         return mDemoted;

core/java/android/app/NotificationManager.java

@@ -953,6 +953,20 @@ public class NotificationManager {
         }
     }
 
+    /**
+     * @hide
+     */
+    @TestApi
+    public void updateNotificationChannel(@NonNull String pkg, int uid,
+            @NonNull NotificationChannel channel) {
+        INotificationManager service = getService();
+        try {
+            service.updateNotificationChannelForPackage(pkg, uid, channel);
+        } catch (RemoteException e) {
+            throw e.rethrowFromSystemServer();
+        }
+    }
+
     /**
      * @hide
      */

non-updatable-api/current.txt

@@ -5957,6 +5957,7 @@ package android.app {
     method public long[] getVibrationPattern();
     method public boolean hasUserSetImportance();
     method public boolean hasUserSetSound();
+    method public boolean isDemoted();
     method public boolean isImportantConversation();
     method public void setAllowBubbles(boolean);
     method public void setBypassDnd(boolean);