DevTools: Route timeline context menu save/load actions through module extensions.

third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js

Index: third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js b/third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js
index 7bbc5571343ff562a5d4673920510ec4b5499b14..11749bc8a5079b04b5f1e3871a118e885ce6276f 100644
--- a/third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js
+++ b/third_party/WebKit/Source/devtools/front_end/timeline/TimelinePanel.js
@@ -445,9 +445,7 @@ WebInspector.TimelinePanel.prototype = {
     _contextMenu: function(event)
     {
         var contextMenu = new WebInspector.ContextMenu(event);
-        var disabled = this._state !== WebInspector.TimelinePanel.State.Idle;
-        contextMenu.appendItem(WebInspector.UIString.capitalize("Save Timeline ^data\u2026"), this._saveToFile.bind(this), disabled);
-        contextMenu.appendItem(WebInspector.UIString.capitalize("Load Timeline ^data\u2026"), this._selectFileToLoad.bind(this), disabled);
+        contextMenu.appendItemsAtLocation("timelineMenu");
         contextMenu.show();
     },
 
@@ -458,6 +456,8 @@ WebInspector.TimelinePanel.prototype = {
     {
         if (this._state !== WebInspector.TimelinePanel.State.Idle)
             return true;
+        if (this._model.isEmpty())
+            return true;
 
         var now = new Date();
         var fileName = "TimelineRawData-" + now.toISO8601Compact() + ".json";