Add an API to determine if a route is connecting.

Bug: 8175766
Change-Id: I54d5f31d4e7d79c471c0e1bbc438cd8ebb4f8a1e

api/current.txt

@@ -12271,6 +12271,7 @@ package android.media {
     method public int getVolume();
     method public int getVolumeHandling();
     method public int getVolumeMax();
+    method public boolean isConnecting();
     method public boolean isEnabled();
     method public void requestSetVolume(int);
     method public void requestUpdateVolume(int);

media/java/android/media/MediaRouter.java

@@ -1354,12 +1354,24 @@ public class MediaRouter {
         }
 
         /**
-         * @return true if this route is enabled and may be selected
+         * Returns true if this route is enabled and may be selected.
+         *
+         * @return True if this route is enabled.
          */
         public boolean isEnabled() {
             return mEnabled;
         }
 
+        /**
+         * Returns true if the route is in the process of connecting and is not
+         * yet ready for use.
+         *
+         * @return True if this route is in the process of connecting.
+         */
+        public boolean isConnecting() {
+            return mStatusCode == STATUS_CONNECTING;
+        }
+
         void setStatusInt(CharSequence status) {
             if (!status.equals(mStatus)) {
                 mStatus = status;