Add 'is:submittable' to search suggestions

Bug: Issue 10568
Change-Id: I6f65c0c8ab9230a5046aca96a62203c270a13377
diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/SearchSuggestOracle.java b/gerrit-gwtui/src/main/java/com/google/gerrit/client/SearchSuggestOracle.java
index cb3e9f0..e74ed71 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/SearchSuggestOracle.java
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/SearchSuggestOracle.java
@@ -138,6 +138,7 @@
     suggestions.add("is:ignored");
     suggestions.add("is:wip");
     suggestions.add("is:assigned");
+    suggestions.add("is:submittable");
 
     suggestions.add("status:");
     suggestions.add("status:open");
diff --git a/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.js b/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.js
index a7a9fe5..de01534 100644
--- a/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.js
+++ b/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.js
@@ -57,6 +57,7 @@
     'is:reviewed',
     'is:reviewer',
     'is:starred',
+    'is:submittable',
     'is:watched',
     'is:wip',
     'label:',