[DevTools] Make resource tree model optional

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

Index: third_party/WebKit/Source/devtools/front_end/timeline/TimelineController.js
diff --git a/third_party/WebKit/Source/devtools/front_end/timeline/TimelineController.js b/third_party/WebKit/Source/devtools/front_end/timeline/TimelineController.js
index 6bc49a7d197ea8434c9f6ec5d4a3dacffa662b13..07f1cbb1db634a74bba992f7274cd46d6f57babe 100644
--- a/third_party/WebKit/Source/devtools/front_end/timeline/TimelineController.js
+++ b/third_party/WebKit/Source/devtools/front_end/timeline/TimelineController.js
@@ -172,14 +172,17 @@ WebInspector.TimelineController.prototype = {
         var options = "sampling-frequency=" + samplingFrequencyHz;
         var target = this._target;
         var tracingManager = target.tracingManager;
-        target.resourceTreeModel.suspendReload();
+        var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(target);
+        if (resourceTreeModel)
+            resourceTreeModel.suspendReload();

[dgozman, 2016/08/19 20:23:37]

Didn't we agree to move suspend/resume to target manager?

[eostroukhov, 2016/08/20 01:22:31]

Done.

         profilingStartedPromise.then(tracingManager.start.bind(tracingManager, this, categories, options, onTraceStarted));
         /**
          * @param {?string} error
          */
         function onTraceStarted(error)
         {
-            target.resourceTreeModel.resumeReload();
+            if (resourceTreeModel)
+                resourceTreeModel.resumeReload();
             if (callback)
                 callback(error);
         }