gwtUI:Update reviewers field when assignee is added

If the assignee is not already a reviewer it is added as reviewer.
Update the reviewer field so that the change is reflected in the UI.

Change-Id: Ib09d1d64d54925a8c56ceaa2cf9a4c08ce26b59d

gerrit-gwtui/src/main/java/com/google/gerrit/client/change/Assignee.java

diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/change/Assignee.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/change/Assignee.java
index 7921ebe..97a1e1d 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/change/Assignee.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/change/Assignee.java
@@ -36,6 +36,8 @@
 import com.google.gwt.uibinder.client.UiBinder;
 import com.google.gwt.uibinder.client.UiField;
 import com.google.gwt.uibinder.client.UiHandler;
+import com.google.gwt.user.client.DOM;
+import com.google.gwt.user.client.EventListener;
 import com.google.gwt.user.client.rpc.StatusCodeException;
 import com.google.gwt.user.client.ui.Composite;
 import com.google.gwt.user.client.ui.HTMLPanel;
@@ -161,6 +163,10 @@
             public void onSuccess(AccountInfo result) {
               onCloseForm();
               setAssignee(result);
+              Reviewers reviewers = getReviewers();
+              if (reviewers != null) {
+                reviewers.updateReviewerList();
+              }
             }
 
             @Override
@@ -189,4 +195,16 @@
                 : String.valueOf(assignee._accountId()))
         : "");
   }
+
+  private Reviewers getReviewers() {
+      Element e = DOM.getParent(getElement());
+      for (e = DOM.getParent(e); e != null; e = DOM.getParent(e)) {
+        EventListener l = DOM.getEventListener(e);
+        if (l instanceof ChangeScreen) {
+          ChangeScreen screen =  (ChangeScreen) l;
+          return screen.reviewers;
+        }
+      }
+      return null;
+  }
 }

gerrit-gwtui/src/main/java/com/google/gerrit/client/change/Reviewers.java

diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/change/Reviewers.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/change/Reviewers.java
index b69d1c0..aa30760 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/change/Reviewers.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/change/Reviewers.java
@@ -198,7 +198,7 @@
         });
   }
 
-  private void updateReviewerList() {
+  void updateReviewerList() {
     ChangeApi.detail(changeId.get(),
         new GerritCallback<ChangeInfo>() {
           @Override