Rename comment-related classes to reduce confusion

Change the names to include "Comment", to make it clear that they are
related to draft comments rather than changes or anything else.

Change-Id: Ie9c82b2fab6797c6e69a97394a5ad1d36cfdb6ec

gerrit-server/src/main/java/com/google/gerrit/server/change/GetDraftComment.java

@@ -0,0 +1,37 @@
+// Copyright (C) 2012 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.change;
+
+import com.google.gerrit.extensions.common.CommentInfo;
+import com.google.gerrit.extensions.restapi.RestReadView;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+
+@Singleton
+public class GetDraftComment implements RestReadView<DraftCommentResource> {
+
+  private final CommentJson commentJson;
+
+  @Inject
+  GetDraftComment(CommentJson commentJson) {
+    this.commentJson = commentJson;
+  }
+
+  @Override
+  public CommentInfo apply(DraftCommentResource rsrc) throws OrmException {
+    return commentJson.format(rsrc.getComment());
+  }
+}