Add submittable support back to PolyGerrit

Submittable was made a ListChangesOption in
https://gerrit-review.googlesource.com/c/86911/

Bug: Issue 4709
Change-Id: I67bb0662df0a0d52f7c7e4ba30f49b79e8111a33

polygerrit-ui/app/behaviors/rest-client-behavior.html

diff --git a/polygerrit-ui/app/behaviors/rest-client-behavior.html b/polygerrit-ui/app/behaviors/rest-client-behavior.html
index 4def9b2..b7cf467 100644
--- a/polygerrit-ui/app/behaviors/rest-client-behavior.html
+++ b/polygerrit-ui/app/behaviors/rest-client-behavior.html
@@ -81,7 +81,13 @@
       COMMIT_FOOTERS: 17,
 
       // Include push certificate information along with any patch sets.
-      PUSH_CERTIFICATES: 18
+      PUSH_CERTIFICATES: 18,
+
+      // Include change's reviewer updates.
+      REVIEWER_UPDATES: 19,
+
+      // Set the submittable boolean.
+      SUBMITTABLE: 20
     },
 
     listChangesOptionsToHex: function() {

polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js

diff --git a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js
index 5eb6e35..90047cd 100644
--- a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js
+++ b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js
@@ -62,7 +62,13 @@
     COMMIT_FOOTERS: 17,
 
     // Include push certificate information along with any patch sets.
-    PUSH_CERTIFICATES: 18
+    PUSH_CERTIFICATES: 18,
+
+    // Include change's reviewer updates.
+    REVIEWER_UPDATES: 19,
+
+    // Set the submittable boolean.
+    SUBMITTABLE: 20
   };
 
   Polymer({
@@ -352,7 +358,8 @@
       var options = this._listChangesOptionsToHex(
           ListChangesOption.ALL_REVISIONS,
           ListChangesOption.CHANGE_ACTIONS,
-          ListChangesOption.DOWNLOAD_COMMANDS
+          ListChangesOption.DOWNLOAD_COMMANDS,
+          ListChangesOption.SUBMITTABLE
       );
       return this._getChangeDetail(changeNum, options, opt_errFn,
           opt_cancelCondition);