Adding getVideoState method to Telecomm Call's details.

Bug: 16013878
Change-Id: I07b219c0952543b7c27694ae06f0eb468a17f1ee

api/current.txt

@@ -27996,6 +27996,7 @@ package android.telecomm {
     method public android.telecomm.GatewayInfo getGatewayInfo();
     method public android.net.Uri getHandle();
     method public int getHandlePresentation();
+    method public int getVideoState();
   }
 
   public static abstract class Call.Listener {

telecomm/java/android/telecomm/Call.java

@@ -153,6 +153,13 @@ public final class Call {
             return mGatewayInfo;
         }
 
+        /**
+         * @return Returns the video state of the {@code Call}.
+         */
+        public int getVideoState() {
+            return mVideoState;
+        }
+
         @Override
         public boolean equals(Object o) {
             if (o instanceof Details) {