Add custom filter to bot-list and task-list

appengine/swarming/elements/res/imp/tasklist/task-filters.html

Index: appengine/swarming/elements/res/imp/tasklist/task-filters.html
diff --git a/appengine/swarming/elements/res/imp/tasklist/task-filters.html b/appengine/swarming/elements/res/imp/tasklist/task-filters.html
index b90da1a483887c6038c3643439c3ee38e8dbb504..a2eaec58b1dc668fd1e75434f274948bda2df0a0 100644
--- a/appengine/swarming/elements/res/imp/tasklist/task-filters.html
+++ b/appengine/swarming/elements/res/imp/tasklist/task-filters.html
@@ -23,6 +23,8 @@
   Events:
     None.
 -->
+
+<link rel="import" href="/res/imp/bower_components/iron-a11y-keys/iron-a11y-keys.html">
 <link rel="import" href="/res/imp/bower_components/iron-flex-layout/iron-flex-layout-classes.html">
 <link rel="import" href="/res/imp/bower_components/iron-icons/iron-icons.html">
 <link rel="import" href="/res/imp/bower_components/iron-selector/iron-selector.html">
@@ -76,10 +78,11 @@
 
       <div class="narrow-down-selector">
         <div>
+          <iron-a11y-keys target="[[_filter_input]]" keys="enter" on-keys-pressed="_manuallyAddFilter"></iron-a11y-keys>
           <paper-input id="filter"
-            label="Search columns and filters"
-            placeholder="gpu nvidia"
-            value="{{_query}}">
+            label="Search columns and filters or supply a filter and press enter"
+            placeholder="gpu nvidia pool:Chrome"
+            value="{{_query::input}}">
           </paper-input>
         </div>