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

chrome/browser/ui/panels/panel.cc

 // 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.
 
 #include "chrome/browser/ui/panels/panel.h"
 
 #include "base/logging.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 67 matching lines @@
 }
 
 PanelManager* Panel::manager() const {
   return PanelManager::GetInstance();
 }
 
 bool Panel::draggable() const {
   return panel_strip_ && panel_strip_->CanDragPanel(this);
 }
 
-bool Panel::CanResizeByMouse() const {
-  return panel_strip_ && panel_strip_->CanResizePanel(this);
+panel::Resizability Panel::CanResizeByMouse() const {
+  if (!panel_strip_)
+    return panel::NOT_RESIZABLE;
+
+  return panel_strip_->CanResizePanel(this);
 }
 
 const Extension* Panel::GetExtension() const {
   return GetExtensionFromBrowser(browser());
 }
 
 // TODO(jennb): do not update restored_size here as there's no knowledge
 // at this point whether the bounds change is due to the content window
 // being resized vs a change in current display bounds, e.g. from overflow
 // size change. Change this when refactoring panel resize logic.
@@ skipping 646 matching lines @@
 }
 
 void Panel::OnTitlebarClicked(panel::ClickModifier modifier) {
   if (panel_strip_)
     panel_strip_->OnPanelTitlebarClicked(this, modifier);
 }
 
 void Panel::DestroyBrowser() {
   native_panel_->DestroyPanelBrowser();
 }