[DevTools] Add preferred size to WebInspector.View.

Source/devtools/front_end/TabbedPane.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 367 matching lines @@
             this.selectTab(effectiveTab.id);
         this.invalidateMinimumSize();
     },
 
     /**
      * @return {!Size}
      */
     calculateMinimumSize: function()
     {
         var size = WebInspector.VBox.prototype.calculateMinimumSize.call(this);
+        var minContentSize = new Size(0, 0, 50, 50);
+        size = size.widthToMax(minContentSize).heightToMax(minContentSize);
         if (this._verticalTabLayout)
-            size.width += this._headerElement.offsetWidth;
+            size = size.addWidth(new Size(this._headerElement.offsetWidth, 0));
         else
-            size.height += this._headerElement.offsetHeight;
+            size = size.addHeight(new Size(0, this._headerElement.offsetHeight));
         return size;
     },
 
     _updateTabElements: function()
     {
         WebInspector.invokeOnceAfterBatchUpdate(this, this._innerUpdateTabElements);
     },
 
     /**
      * @param {string} text
@@ skipping 726 matching lines @@
     {
         if (this._views.contains(id))
             return /** @type {!WebInspector.View} */ (this._views.get(id));
         var view = this._extensions[id] ? /** @type {!WebInspector.View} */ (this._extensions[id].instance()) : null;
         this._views.put(id, view);
         if (this._viewCallback && view)
             this._viewCallback(id, view);
         return view;
     }
 }