Revert of Make profiling lock global rather than per Target

Source/devtools/front_end/timeline/TimelinePanel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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.
@@ skipping 16 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 /**
  * @constructor
  * @extends {WebInspector.Panel}
  * @implements {WebInspector.TimelineModeViewDelegate}
  * @implements {WebInspector.Searchable}
+ * @implements {WebInspector.TargetManager.Observer}
  */
 WebInspector.TimelinePanel = function()
 {
     WebInspector.Panel.call(this, "timeline");
     this.registerRequiredCSS("timelinePanel.css");
     this.registerRequiredCSS("layersPanel.css");
     this.registerRequiredCSS("filter.css");
     this.element.addEventListener("contextmenu", this._contextMenu.bind(this), false);
 
     this._detailsLinkifier = new WebInspector.Linkifier();
@@ skipping 69 matching lines @@
     this._stackView = new WebInspector.StackView(false);
     this._stackView.show(this._searchableView.element);
     this._stackView.element.classList.add("timeline-view-stack");
 
     WebInspector.dockController.addEventListener(WebInspector.DockController.Events.DockSideChanged, this._dockSideChanged.bind(this));
     WebInspector.settings.splitVerticallyWhenDockedToRight.addChangeListener(this._dockSideChanged.bind(this));
     this._dockSideChanged();
 
     this._onModeChanged();
     this._detailsSplitView.show(this.element);
-    WebInspector.profilingLock.addEventListener(WebInspector.Lock.Events.StateChanged, this._onProfilingStateChanged, this);
 }
 
 WebInspector.TimelinePanel.OverviewMode = {
     Events: "Events",
     Frames: "Frames"
 };
 
 // Define row and header height, should be in sync with styles for timeline graphs.
 WebInspector.TimelinePanel.rowHeight = 18;
 WebInspector.TimelinePanel.headerHeight = 20;
 
 WebInspector.TimelinePanel.durationFilterPresetsMs = [0, 1, 15];
 
 WebInspector.TimelinePanel.prototype = {
     /**
+     * @param {!WebInspector.Target} target
+     */
+    targetAdded: function(target)
+    {
+        target.profilingLock.addEventListener(WebInspector.Lock.Events.StateChanged, this._onProfilingStateChanged, this);
+    },
+
+    /**
+     * @param {!WebInspector.Target} target
+     */
+    targetRemoved: function(target)
+    {
+        target.profilingLock.removeEventListener(WebInspector.Lock.Events.StateChanged, this._onProfilingStateChanged, this);
+    },
+
+    /**
      * @return {?WebInspector.SearchableView}
      */
     searchableView: function()
     {
         return this._searchableView;
     },
 
     wasShown: function()
     {
         if (!WebInspector.TimelinePanel._categoryStylesInitialized) {
@@ skipping 515 matching lines @@
     _onProfilingStateChanged: function()
     {
         this._updateToggleTimelineButton(this.toggleTimelineButton.toggled);
     },
 
     /**
      * @param {boolean} toggled
      */
     _updateToggleTimelineButton: function(toggled)
     {
-        var isAcquiredInSomeTarget = WebInspector.profilingLock.isAcquired();
+        var isAcquiredInSomeTarget = WebInspector.targetManager.targets().some(function(target) { return target.profilingLock.isAcquired(); });
         this.toggleTimelineButton.toggled = toggled;
         if (toggled) {
             this.toggleTimelineButton.title = WebInspector.UIString("Stop");
             this.toggleTimelineButton.setEnabled(true);
         } else if (this._stopPending) {
             this.toggleTimelineButton.title = WebInspector.UIString("Stop pending");
             this.toggleTimelineButton.setEnabled(false);
         } else if (isAcquiredInSomeTarget) {
             this.toggleTimelineButton.title = WebInspector.anotherProfilerActiveLabel();
             this.toggleTimelineButton.setEnabled(false);
@@ skipping 722 matching lines @@
      * @param {!WebInspector.TimelineModel.Record} record
      * @return {boolean}
      */
     accept: function(record)
     {
         return !this._regex || this._uiUtils.testContentMatching(record, this._regex);
     },
 
     __proto__: WebInspector.TimelineModel.Filter.prototype
 }