Make profiling lock global rather than per Target

Source/devtools/front_end/sdk/DebuggerModel.js

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 37 matching lines @@
     this._scriptsBySourceURL = new StringMap();
 
     /** @type {!WebInspector.Object} */
     this._breakpointResolvedEventTarget = new WebInspector.Object();
 
     this._isPausing = false;
     WebInspector.settings.pauseOnExceptionEnabled.addChangeListener(this._pauseOnExceptionStateChanged, this);
     WebInspector.settings.pauseOnCaughtException.addChangeListener(this._pauseOnExceptionStateChanged, this);
 
     WebInspector.settings.enableAsyncStackTraces.addChangeListener(this._asyncStackTracesStateChanged, this);
-    target.profilingLock.addEventListener(WebInspector.Lock.Events.StateChanged, this._profilingStateChanged, this);
+    WebInspector.profilingLock.addEventListener(WebInspector.Lock.Events.StateChanged, this._profilingStateChanged, this);
 
     this.enableDebugger();
 
     WebInspector.settings.skipStackFramesPattern.addChangeListener(this._applySkipStackFrameSettings, this);
     this._applySkipStackFrameSettings();
 }
 
 /** @typedef {{location: ?WebInspector.DebuggerModel.Location, sourceURL: ?string, functionName: string, scopeChain: (Array.<!DebuggerAgent.Scope>|null)}} */
 WebInspector.DebuggerModel.FunctionDetails;
 
@@ skipping 95 matching lines @@
             state = WebInspector.DebuggerModel.PauseOnExceptionsState.PauseOnAllExceptions;
         } else {
             state = WebInspector.DebuggerModel.PauseOnExceptionsState.PauseOnUncaughtExceptions;
         }
         this._agent.setPauseOnExceptions(state);
     },
 
     _profilingStateChanged: function()
     {
         if (WebInspector.experimentsSettings.disableAgentsWhenProfile.isEnabled()) {
-            if (this.target().profilingLock.isAcquired())
+            if (WebInspector.profilingLock.isAcquired())
                 this.disableDebugger();
             else
                 this.enableDebugger();
         }
         this._asyncStackTracesStateChanged();
     },
 
     _asyncStackTracesStateChanged: function()
     {
         const maxAsyncStackChainDepth = 4;
-        var enabled = WebInspector.settings.enableAsyncStackTraces.get() && !this.target().profilingLock.isAcquired();
+        var enabled = WebInspector.settings.enableAsyncStackTraces.get() && !WebInspector.profilingLock.isAcquired();
         this._agent.setAsyncCallStackDepth(enabled ? maxAsyncStackChainDepth : 0);
     },
 
     stepInto: function()
     {
         /**
          * @this {WebInspector.DebuggerModel}
          */
         function callback()
         {
@@ skipping 904 matching lines @@
         return this.target().runtimeModel.createRemoteObject(/** @type {!RuntimeAgent.RemoteObject} */(this.auxData));
     },
 
     __proto__: WebInspector.SDKObject.prototype
 }
 
 /**
  * @type {!WebInspector.DebuggerModel}
  */
 WebInspector.debuggerModel;