DevTools: WI.Throttler goes promisified.

Source/devtools/front_end/ui_lazy/TimelineOverviewPane.js

Index: Source/devtools/front_end/ui_lazy/TimelineOverviewPane.js
diff --git a/Source/devtools/front_end/ui_lazy/TimelineOverviewPane.js b/Source/devtools/front_end/ui_lazy/TimelineOverviewPane.js
index 64b6a15a92af12d6375d45f69a11840076a00f1b..1bc2f3750fbfe138e886b28d8c5a1a30ba5127bc 100644
--- a/Source/devtools/front_end/ui_lazy/TimelineOverviewPane.js
+++ b/Source/devtools/front_end/ui_lazy/TimelineOverviewPane.js
@@ -214,12 +214,12 @@ WebInspector.TimelineOverviewPane.prototype = {
         this._updateThrottler.schedule(process.bind(this));
         /**
          * @this {WebInspector.TimelineOverviewPane}
-         * @param {!WebInspector.Throttler.FinishCallback} callback
+         * @return {!Promise.<undefined>}
          */
-        function process(callback)
+        function process()
         {
             this._update();
-            callback();
+            return Promise.resolve();
         }
     },