[MD History] Unify query state in history-app.

chrome/browser/resources/md_history/app.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-pages/iron-pages.html">
 <link rel="import" href="chrome://history/history_list.html">
 <link rel="import" href="chrome://history/history_toolbar.html">
 <link rel="import" href="chrome://history/synced_device_manager.html">
 <link rel="import" href="chrome://history/side_bar.html">
 <link rel="import" href="chrome://history/shared_style.html">
 
 <dom-module id="history-app">
@@ skipping 20 matching lines @@
 
       #content {
         display: flex;
         flex: 1 0 0;
       }
 
       history-toolbar {
         background: var(--md-toolbar-color);
       }
     </style>
-    <history-toolbar id="toolbar"></history-toolbar>
+    <history-toolbar id="toolbar" searching="[[queryState_.querying]]"
+        search-term="{{queryState_.searchTerm}}"
+        query-start-time="[[queryState_.queryStartTime]]"
+        query-end-time="[[queryState_.queryEndTime]]">
+    </history-toolbar>
 
     <div id="main-container">
       <history-side-bar id="history-side-bar" selected-page="{{selectedPage}}">
       </history-side-bar>
       <iron-pages id="content" attr-for-selected="id"
           selected="{{selectedPage}}">
-        <history-list id="history-list"></history-list>
+        <history-list id="history-list" querying="[[queryState_.querying]]"
+            searched-term="{{queryState_.info.term}}">

[tsergeant, 2016/05/13 03:41:06]

If I'm reading this correctly, this will set searchedTerm before the results
actually come from the backend?

Does this have any side effects? Eg, changing "100 results for Search 1" to "100
results for Search 2" before the results change.

Having searchedTerm be inconsistent scares me a little.

[calamity, 2016/05/18 01:41:52]

As discussed, this is set when the query returns.

+        </history-list>
         <history-synced-device-manager id="history-synced-device-manager">
         </history-synced-device-manager>
       </iron-pages>
     </div>
   </template>
   <script src="chrome://history/app.js"></script>
 </dom-module>