Ensure that framework does not refer MediaSession2 related code

Also, this CL moves mediasession2 to com.android.media apex.

Bug: 123495968
Test: Passed below tests:
atest CtsMediaTestCases:android.media.cts.MediaSession2Test;
atest CtsMediaTestCases:android.media.cts.MediaController2Test;
atest CtsMediaTestCases:android.media.cts.MediaItem2Test;
atest CtsMediaTestCases:android.media.cts.MediaSession2ServiceTest;
atest CtsMediaTestCases:android.media.cts.Session2CommandGroupTest;
atest CtsMediaTestCases:android.media.cts.Session2CommandTest;
Change-Id: I8cf7a657545e6b7b2973035f365506206e7147a0

Android.bp

@@ -49,9 +49,8 @@ java_defaults {
         "rs/java/**/*.java",
 
         ":framework-javastream-protos",
-        // TODO: Resolve circular library dependency and remove media1-srcs and mediasession2-srcs
+        // TODO: Resolve circular library dependency and remove media1-srcs
         ":media1-srcs",
-        ":mediasession2-srcs",
 
         "core/java/android/accessibilityservice/IAccessibilityServiceConnection.aidl",
         "core/java/android/accessibilityservice/IAccessibilityServiceClient.aidl",

api/current.txt

@@ -25959,6 +25959,7 @@ package android.media {
     method @NonNull public abstract android.media.MediaSession2 onGetPrimarySession();
     method @Nullable public abstract android.media.MediaSession2Service.MediaNotification onUpdateNotification(@NonNull android.media.MediaSession2);
     method public final void removeSession(@NonNull android.media.MediaSession2);
+    field public static final String SERVICE_INTERFACE = "android.media.MediaSession2Service";
   }
 
   public static class MediaSession2Service.MediaNotification {

media/Android.bp

@@ -25,9 +25,10 @@ java_library {
 }
 
 java_library {
-    name: "updatable-mediasession2",
+    name: "updatable-media",
 
     srcs: [
+        ":mediaplayer2-srcs",
         ":mediasession2-srcs",
         ":framework-media-annotation-srcs",
     ],
@@ -37,26 +38,12 @@ java_library {
             "apex/java",
         ],
 
-        // TODO: find out a way to include only the necessary aidl files instead of dirs.
         include_dirs: [
+            // For the usage of android.os.Bundle and android.os.ResultReceiver in aidl files
             "frameworks/base/core/java",
         ],
     },
 
-    installable: true,
-
-    // Make sure that the implementaion only relies on SDK or system APIs.
-    sdk_version: "system_current",
-}
-
-java_library {
-    name: "updatable-media",
-
-    srcs: [
-        ":mediaplayer2-srcs",
-        ":framework-media-annotation-srcs",
-    ],
-
     static_libs: [
         "mediaplayer2-protos",
     ],

media/apex/java/android/media/MediaSession2Service.java

@@ -16,8 +16,6 @@
 
 package android.media;
 
-import static android.media.Session2Token.SESSION_SERVICE_INTERFACE;
-
 import android.annotation.CallSuper;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
@@ -47,6 +45,10 @@ import java.util.Map;
  * for consistent behavior across all devices.
  */
 public abstract class MediaSession2Service extends Service {
+    /**
+     * The {@link Intent} that must be declared as handled by the service.
+     */
+    public static final String SERVICE_INTERFACE = Session2Token.SESSION_SERVICE_INTERFACE;
 
     private static final String TAG = "MediaSession2Service";
     private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
@@ -98,7 +100,7 @@ public abstract class MediaSession2Service extends Service {
     @Override
     @Nullable
     public IBinder onBind(@NonNull Intent intent) {
-        if (SESSION_SERVICE_INTERFACE.equals(intent.getAction())) {
+        if (SERVICE_INTERFACE.equals(intent.getAction())) {
             synchronized (mLock) {
                 return mStub;
             }