DevTools: Do not run CPU profiler on targets with no JS capability.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @param {!WebInspector.Target} target
  * @param {!WebInspector.TimelineLifecycleDelegate} delegate
  * @param {!WebInspector.TracingModel} tracingModel
  * @implements {WebInspector.TargetManager.Observer}
@@ skipping 91 matching lines @@
         // FIXME: We'd like to stop profiling on the target and retrieve a profile
         // but it's too late. Backend connection is closed.
     },
 
     /**
      * @param {!WebInspector.Target} target
      * @return {!Promise}
      */
     _startProfilingOnTarget: function(target)
     {
-        return target.profilerAgent().start();
+        return target.hasJSCapability() ? target.profilerAgent().start() : Promise.resolve();
     },
 
     /**
      * @return {!Promise}
      */
     _startProfilingOnAllTargets: function()
     {
         var intervalUs = WebInspector.moduleSetting("highResolutionCpuProfiling").get() ? 100 : 1000;
         this._target.profilerAgent().setSamplingInterval(intervalUs);
         this._profiling = true;
         return Promise.all(this._targets.map(this._startProfilingOnTarget));
     },
 
     /**
      * @param {!WebInspector.Target} target
      * @return {!Promise}
      */
     _stopProfilingOnTarget: function(target)
     {
-        return target.profilerAgent().stop(this._addCpuProfile.bind(this, target.id()));
+        return target.hasJSCapability() ? target.profilerAgent().stop(this._addCpuProfile.bind(this, target.id())) : Promise.resolve();
     },
 
     /**
      * @param {number} targetId
      * @param {?Protocol.Error} error
      * @param {?ProfilerAgent.Profile} cpuProfile
      */
     _addCpuProfile: function(targetId, error, cpuProfile)
     {
         if (!cpuProfile) {
@@ skipping 135 matching lines @@
 
     /**
      * @param {number} progress
      * @override
      */
     eventsRetrievalProgress: function(progress)
     {
         this._delegate.loadingProgress(progress);
     }
 }