DevTools: better error handling in paint profiler UI

Source/devtools/front_end/ui_lazy/OverviewGrid.js

 /*
  * Copyright (C) 2013 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 112 matching lines @@
     zoom: function(zoomFactor, referencePoint)
     {
         this._window._zoom(zoomFactor, referencePoint);
     },
 
     /**
      * @param {boolean} enabled
      */
     setResizeEnabled: function(enabled)
     {
-        this._window._setEnabled(!!enabled);
+        this._window.setEnabled(!!enabled);
     }
 }
 
 
 WebInspector.OverviewGrid.MinSelectableSize = 14;
 
 WebInspector.OverviewGrid.WindowScrollSpeedFactor = .3;
 
 WebInspector.OverviewGrid.ResizerOffset = 3.5; // half pixel because offset values are not rounded but ceiled
 
@@ skipping 27 matching lines @@
     this._currentPositionArea.addEventListener("mousemove", this._onMouseMove.bind(this), true);
     this._currentPositionArea.addEventListener("mouseout", this._hideCurrentPosition.bind(this), true);
 
     this._leftResizeElement = parentElement.createChild("div", "overview-grid-window-resizer");
     this._leftResizeElement.style.left = 0;
     WebInspector.installDragHandle(this._leftResizeElement, this._resizerElementStartDragging.bind(this), this._leftResizeElementDragging.bind(this), null, "ew-resize");
 
     this._rightResizeElement = parentElement.createChild("div", "overview-grid-window-resizer overview-grid-window-resizer-right");
     this._rightResizeElement.style.right = 0;
     WebInspector.installDragHandle(this._rightResizeElement, this._resizerElementStartDragging.bind(this), this._rightResizeElementDragging.bind(this), null, "ew-resize");
-    this._setEnabled(true);
+    this.setEnabled(true);
 }
 
 WebInspector.OverviewGrid.Events = {
     WindowChanged: "WindowChanged",
     Click: "Click"
 }
 
 WebInspector.OverviewGrid.Window.prototype = {
     reset: function()
     {
         this.windowLeft = 0.0;
         this.windowRight = 1.0;
 
         this._overviewWindowElement.style.left = "0%";
         this._overviewWindowElement.style.width = "100%";
         this._overviewWindowBordersElement.style.left = "0%";
         this._overviewWindowBordersElement.style.right = "0%";
         this._leftResizeElement.style.left = "0%";
         this._rightResizeElement.style.left = "100%";
-        this._setEnabled(true);
+        this.setEnabled(true);
     },
 
     /**
      * @param {boolean} enabled
      */
-    _setEnabled: function(enabled)
+    setEnabled: function(enabled)
     {
         enabled = !!enabled;
         if (this._enabled === enabled)
             return;
         this._enabled = enabled;
         this._currentPositionArea.style.cursor = enabled ? "text" : "";
         if (!enabled)
             this._hideCurrentPosition();
     },
 
@@ skipping 276 matching lines @@
         position = Math.max(0, Math.min(position, this._width));
         if (position < this._startPosition) {
             this._windowSelector.style.left = position + "px";
             this._windowSelector.style.right = this._width - this._startPosition + "px";
         } else {
             this._windowSelector.style.left = this._startPosition + "px";
             this._windowSelector.style.right = this._width - position + "px";
         }
     }
 }