Support detaching/attaching panels via inter-strip drags.

chrome/browser/ui/panels/panel_browser_window_cocoa.mm

 // 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_cocoa.h"
 
 #include "base/logging.h"
 #include "chrome/browser/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
@@ skipping 241 matching lines @@
 }
 
 void PanelBrowserWindowCocoa::EnsurePanelFullyVisible() {
   [controller_ ensureFullyVisible];
 }
 
 void PanelBrowserWindowCocoa::SetPanelAppIconVisibility(bool visible) {
   // TODO(dimich): to be implemented.
 }
 
+void PanelBrowserWindowCocoa::SetPanelAlwaysOnTop(bool on_top) {
+  [controller_ setAlwaysOnTop:on_top];
+}
+
 void PanelBrowserWindowCocoa::DidCloseNativeWindow() {
   DCHECK(!isClosed());
   panel_->OnNativePanelClosed();
   controller_ = NULL;
 }
 
 gfx::Size PanelBrowserWindowCocoa::WindowSizeFromContentSize(
     const gfx::Size& content_size) const {
   NSWindow* window = [controller_ window];
   NSRect content = NSMakeRect(0, 0,
@@ skipping 99 matching lines @@
   return false;
 }
 
 bool NativePanelTestingCocoa::IsWindowSizeKnown() const {
   return true;
 }
 
 bool NativePanelTestingCocoa::IsAnimatingBounds() const {
   return [native_panel_window_->controller_ isAnimatingBounds];
 }