Make MediaSessionToken an inner class of MediaSession.

Also add some missing AIDLs to the framework makefile to ensure
they are included in the SDK.

Change-Id: If85a3091c7591e0b3bbe6cc4bb74aba2284b4f42
diff --git a/Android.mk b/Android.mk
index a38e9e7..a6271d2 100644
--- a/Android.mk
+++ b/Android.mk
@@ -509,6 +509,10 @@
 	frameworks/base/location/java/android/location/FusedBatchOptions.aidl \
 	frameworks/base/location/java/com/android/internal/location/ProviderProperties.aidl \
 	frameworks/base/location/java/com/android/internal/location/ProviderRequest.aidl \
+	frameworks/base/media/java/android/media/MediaMetadata.aidl \
+	frameworks/base/media/java/android/media/Rating.aidl \
+	frameworks/base/media/java/android/media/session/MediaSession.aidl \
+	frameworks/base/media/java/android/media/session/PlaybackState.aidl \
 	frameworks/base/telephony/java/android/telephony/ServiceState.aidl \
 	frameworks/base/telephony/java/com/android/internal/telephony/IPhoneSubInfo.aidl \
 	frameworks/base/telephony/java/com/android/internal/telephony/ITelephony.aidl \