Support detaching/attaching panels via inter-strip drags.

chrome/browser/ui/panels/panel_browser_window_gtk.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_browser_window_gtk.h"
 
 #include "base/bind.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/gtk/browser_titlebar.h"
 #include "chrome/browser/ui/panels/panel.h"
@@ skipping 464 matching lines @@
 }
 
 void PanelBrowserWindowGtk::EnsurePanelFullyVisible() {
   gtk_window_present(window());
 }
 
 void PanelBrowserWindowGtk::SetPanelAppIconVisibility(bool visible) {
   return;
 }
 
+void PanelBrowserWindowGtk::SetPanelAlwaysOnTop(bool on_top) {
+  gtk_window_set_keep_above(window(), on_top);
+}
+
 gfx::Size PanelBrowserWindowGtk::WindowSizeFromContentSize(
     const gfx::Size& content_size) const {
   gfx::Size frame = GetNonClientFrameSize();
   return gfx::Size(content_size.width() + frame.width(),
                    content_size.height() + frame.height());
 }
 
 gfx::Size PanelBrowserWindowGtk::ContentSizeFromWindowSize(
     const gfx::Size& window_size) const {
   gfx::Size frame = GetNonClientFrameSize();
@@ skipping 380 matching lines @@
     MessageLoopForUI::current()->RunAllPending();
 }
 
 bool NativePanelTestingGtk::IsWindowSizeKnown() const {
   return panel_browser_window_gtk_->window_size_known_;
 }
 
 bool NativePanelTestingGtk::IsAnimatingBounds() const {
   return panel_browser_window_gtk_->IsAnimatingBounds();
 }