Bug 1389165 - Fix the search for thread hangs in about:telemetry r=chutten

MozReview-Commit-ID: 8nYRcwEEBvD

--HG--
extra : rebase_source : 3dea7d1831bb3a004a1ae710d60b5baa6609dbfa

toolkit/content/aboutTelemetry.js

@@ -1167,6 +1167,7 @@ var ThreadHangStats = {
     let title = document.createElement("h2");
     title.textContent = aThread.name;
     div.appendChild(title);
+    div.id = title;
 
     // Don't localize the histogram name, because the
     // name is also used as the div element's ID
@@ -1479,6 +1480,14 @@ var Search = {
         keyedElements.push({key, datas});
       }
       this.filterKeyedElements(keyedElements, text);
+    } else if (selectedSection.id === "thread-hang-stats-section") {
+      let keyedElements = [];
+      let threads = selectedSection.children[0].children;
+      for (let key of threads) {
+        let datas = key.getElementsByClassName("histogram");
+        keyedElements.push({key, datas});
+      }
+      this.filterKeyedElements(keyedElements, text);
     } else {
       let tables = selectedSection.querySelectorAll("table");
       for (let table of tables) {