Enable user resizing for docked Panels (GTK and Mac).

chrome/browser/ui/panels/panel_strip.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_UI_PANELS_PANEL_STRIP_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_STRIP_H_
 #pragma once
 
 #include "chrome/browser/ui/panels/panel_constants.h"
 #include "ui/gfx/point.h"
@@ skipping 45 matching lines @@
   virtual void CloseAll() = 0;
 
   // Resizes the |panel| to the |preferred_window_size| and updates the layout
   // of other panels in the collection accordingly.
   // |preferred_window_size| is the outer dimensions of the window, not
   // the content area, and is in screen coordinates.
   // The preferred size may be adjusted to fit layout constraints.
   virtual void ResizePanelWindow(Panel* panel,
                                  const gfx::Size& preferred_window_size) = 0;
 
-  // Returns true if |panel| can be resized by the user when in this strip.
-  virtual bool CanResizePanel(const Panel* panel) const = 0;
+  // Returns the sides from which |panel| can be resized by the user
+  // if |panel| is resizable in this strip.
+  virtual panel::Resizability GetPanelResizability(
+      const Panel* panel) const = 0;
 
   // Change panel's bounds and take care of all possible side effects
   // in ths strip as a result of the panel being resized by the user.
   // TODO (AndreiB) Add a parameter telling what how to approach animation
   // (no animation, continue existing, or start new).
   virtual void OnPanelResizedByMouse(Panel* panel,
                                      const gfx::Rect& new_bounds) = 0;
 
   // Invoked when the draw attention state of the panel has changed.
   // Subclass should update the display of the panel to match the new
@@ skipping 54 matching lines @@
   virtual void UpdatePanelOnStripChange(Panel* panel) = 0;
 
  protected:
   explicit PanelStrip(Type type);
   virtual ~PanelStrip();
 
   const Type type_;  // Type of this panel strip.
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_STRIP_H_