[UMA, Android, MediaFling] Record the domain and registry of the frame url when casting.

chrome/android/java/src/org/chromium/chrome/browser/media/remote/DefaultMediaRouteController.java

Index: chrome/android/java/src/org/chromium/chrome/browser/media/remote/DefaultMediaRouteController.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/media/remote/DefaultMediaRouteController.java b/chrome/android/java/src/org/chromium/chrome/browser/media/remote/DefaultMediaRouteController.java
index 5e8bf543b4ec82f722e4960d3027303ab43222ae..a1ae9d1e3c6218539154eeabd32a39a29249103d 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/media/remote/DefaultMediaRouteController.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/media/remote/DefaultMediaRouteController.java
@@ -807,6 +807,8 @@ public class DefaultMediaRouteController extends AbstractMediaRouteController {
         // checkIfPlayableRemotely will have rejected null URLs.
         assert url != null;
 
+        RecordCastAction.castDomainAndRegistry(listener.getFrameUrl().toString());
+
         mLocalVideoUri = Uri.parse(url);
         mStartPositionMillis = listener.getStartPositionMillis();
         playUri(listener.getTitle(), mStartPositionMillis);