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

chrome/browser/ui/panels/docked_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/docked_panel_strip.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/auto_reset.h"
@@ skipping 416 matching lines @@
 
   // Calls RefreshLayout to update the dragging panel to its final position
   // when the drag ends normally. Otherwise, the drag within this strip is
   // aborted because either the drag enters other strip or the drag is
   // cancelled. Either way, we don't need to do anything here and let the drag
   // controller handle the inter-strip transition or the drag cancellation.
   if (!aborted)
     RefreshLayout();
 }
 
-bool DockedPanelStrip::CanResizePanel(const Panel* panel) const {
-  return false;
+panel::Resizability DockedPanelStrip::CanResizePanel(
+    const Panel* panel) const {
+  return panel->expansion_state() == Panel::EXPANDED ?
+    panel::ALL_SIDES_EXCEPT_BOTTOM : panel::NOT_RESIZABLE;
 }
 
 void DockedPanelStrip::OnPanelResizedByMouse(Panel* panel,
                                              const gfx::Rect& new_bounds) {
   DCHECK_EQ(this, panel->panel_strip());
-  NOTREACHED();
+  panel->SetPanelBoundsInstantly(new_bounds);
 }
 
 
 void DockedPanelStrip::OnPanelExpansionStateChanged(Panel* panel) {
   gfx::Size size = panel->restored_size();
   Panel::ExpansionState expansion_state = panel->expansion_state();
   switch (expansion_state) {
     case Panel::EXPANDED:
 
       break;
@@ skipping 424 matching lines @@
   // Always update limits, even on existing panels, in case the limits changed
   // while panel was out of the strip.
   int max_panel_width = GetMaxPanelWidth();
   int max_panel_height = GetMaxPanelHeight();
   panel->SetSizeRange(gfx::Size(kPanelMinWidth, kPanelMinHeight),
                       gfx::Size(max_panel_width, max_panel_height));
 
   panel->set_attention_mode(Panel::USE_PANEL_ATTENTION);
   panel->SetAppIconVisibility(true);
   panel->SetAlwaysOnTop(true);
-  panel->EnableResizeByMouse(false);
+  panel->EnableResizeByMouse(true);
 }