Add configs for enabling attention set and assignee

Change-Id: Ie1d5757150726df145be9d64677d785abf845ea0

Documentation/config-gerrit.txt

@@ -1222,6 +1222,20 @@ If set to true, users are not allowed to create private changes.
 +
 The default is false.
 
+[[change.enableAttentionSet]]change.enableAttentionSet::
++
+If set to true, then all UI features for using and interacting with the
+attention set are enabled.
++
+The default is false for now, but will be changed to true in Q2 2020.
+
+[[change.enableAssignee]]change.enableAssignee::
++
+If set to true, then all UI features for using and interacting with the
+assignee are enabled.
++
+The default is true for now, but will be changed to false in Q2 2020.
+
 [[change.largeChange]]change.largeChange::
 +
 Number of changed lines from which on a change is considered as a large

Documentation/rest-api-config.txt

@@ -1574,6 +1574,10 @@ Value of the link:config-gerrit.html#change.mergeabilityComputationBehavior[
 configuration parameter] that controls whether the mergeability bit in
 link:rest-api-changes.html#change-info[ChangeInfo] will never be set and if the
 bit is indexed.
+|`enable_attention_set` |defaults to `false`|
+Returns true if attention set UI features are enabled.
+|`enable_assignee` |defaults to `true`|
+Returns true if assignee related UI features are enabled.
 |=============================
 
 [[change-index-config-info]]

java/com/google/gerrit/extensions/common/ChangeConfigInfo.java

@@ -25,4 +25,6 @@ public class ChangeConfigInfo {
   public int updateDelay;
   public Boolean submitWholeTopic;
   public String mergeabilityComputationBehavior;
+  public Boolean enableAttentionSet;
+  public Boolean enableAssignee;
 }

java/com/google/gerrit/server/restapi/config/GetServerInfo.java

@@ -237,6 +237,9 @@ public class GetServerInfo implements RestReadView<ConfigResource> {
         toBoolean(this.config.getBoolean("change", null, "disablePrivateChanges", false));
     info.mergeabilityComputationBehavior =
         MergeabilityComputationBehavior.fromConfig(config).name();
+    info.enableAttentionSet =
+        toBoolean(this.config.getBoolean("change", null, "enableAttentionSet", false));
+    info.enableAssignee = toBoolean(this.config.getBoolean("change", null, "enableAssignee", true));
     return info;
   }
 

javatests/com/google/gerrit/acceptance/rest/config/ServerInfoIT.java

@@ -63,6 +63,8 @@ public class ServerInfoIT extends AbstractDaemonTest {
   @GerritConfig(name = "change.replyLabel", value = "Vote")
   @GerritConfig(name = "change.updateDelay", value = "50s")
   @GerritConfig(name = "change.disablePrivateChanges", value = "true")
+  @GerritConfig(name = "change.enableAttentionSet", value = "true")
+  @GerritConfig(name = "change.enableAssignee", value = "true")
 
   // download
   @GerritConfig(
@@ -105,6 +107,8 @@ public class ServerInfoIT extends AbstractDaemonTest {
     assertThat(i.change.replyLabel).isEqualTo("Vote\u2026");
     assertThat(i.change.updateDelay).isEqualTo(50);
     assertThat(i.change.disablePrivateChanges).isTrue();
+    assertThat(i.change.enableAttentionSet).isTrue();
+    assertThat(i.change.enableAssignee).isTrue();
 
     // download
     assertThat(i.download.archives).containsExactly("tar", "tbz2", "tgz", "txz");