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

chrome/browser/ui/panels/overflow_panel_strip.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/overflow_panel_strip.h"
 
 #include "base/logging.h"
 #include "chrome/browser/ui/panels/panel_manager.h"
 #include "chrome/browser/ui/panels/panel_mouse_watcher.h"
 #include "chrome/browser/ui/panels/panel_overflow_indicator.h"
@@ skipping 213 matching lines @@
                                               int delta_x,
                                               int delta_y) {
   NOTREACHED();
 }
 
 void OverflowPanelStrip::EndDraggingPanelWithinStrip(Panel* panel,
                                                      bool aborted) {
   NOTREACHED();
 }
 
-bool OverflowPanelStrip::CanResizePanel(const Panel* panel) const {
-  return false;
+panel::Resizability OverflowPanelStrip::CanResizePanel(
+    const Panel* panel) const {
+  return panel::NOT_RESIZABLE;
 }
 
 void OverflowPanelStrip::OnPanelResizedByMouse(Panel* panel,
                                                const gfx::Rect& new_bounds) {
   DCHECK_EQ(this, panel->panel_strip());
   NOTREACHED();
 }
 
 void OverflowPanelStrip::RefreshLayout() {
   if (panels_.empty())
@@ skipping 205 matching lines @@
     panels_[i]->FullScreenModeChanged(is_full_screen);
 }
 
 void OverflowPanelStrip::UpdatePanelOnStripChange(Panel* panel) {
   // Set panel properties for this strip.
   panel->set_attention_mode(Panel::USE_PANEL_ATTENTION);
   panel->SetAppIconVisibility(false);
   panel->SetAlwaysOnTop(true);
   panel->EnableResizeByMouse(false);
 }