ChangeScreen2: Display draft comments in the reply box

Display all pending draft comments between the label radio buttons
and the Send/Cancel button row.  Use a scrolling panel to keep the
box from exploding in height when there are many comments.

Include the comments in the /review POST body and do not publish
anything other than what was displayed on the UI.

Change-Id: I5d749ef1276aed04d603da45e618210c3a557a00

gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/ReviewInput.java

@@ -14,31 +14,59 @@
 
 package com.google.gerrit.client.changes;
 
+import com.google.gerrit.client.rpc.NativeMap;
 import com.google.gwt.core.client.JavaScriptObject;
+import com.google.gwt.core.client.JsArray;
 
 public class ReviewInput extends JavaScriptObject {
   public static enum NotifyHandling {
     NONE, OWNER, OWNER_REVIEWERS, ALL
   }
 
+  public static enum DraftHandling {
+    DELETE, PUBLISH, KEEP
+  }
+
   public static ReviewInput create() {
     ReviewInput r = createObject().cast();
     r.init();
+    r.drafts(DraftHandling.PUBLISH);
     return r;
   }
 
   public final native void message(String m) /*-{ if(m)this.message=m; }-*/;
   public final native void label(String n, short v) /*-{ this.labels[n]=v; }-*/;
+  public final native void comments(NativeMap<JsArray<CommentInfo>> m)
+  /*-{ this.comments=m }-*/;
 
   public final void notify(NotifyHandling e) {
     _notify(e.name());
   }
   private final native void _notify(String n) /*-{ this.notify=n; }-*/;
 
+  public final void drafts(DraftHandling e) {
+    _drafts(e.name());
+  }
+  private final native void _drafts(String n) /*-{ this.drafts=n; }-*/;
+
   private final native void init() /*-{
     this.labels = {};
     this.strict_labels = true;
-    this.drafts = 'PUBLISH';
+  }-*/;
+
+  public final native void prePost() /*-{
+    var m=this.comments;
+    if (m) {
+      for (var p in m) {
+        var l=m[p];
+        for (var i=0;i<l.length;i++) {
+          var c=l[i];
+          delete c['kind'];
+          delete c['path'];
+          delete c['updated'];
+        }
+      }
+    }
   }-*/;
 
   protected ReviewInput() {