aura: Some changes in Window and Desktop.

ui/aura/desktop.cc

 // Copyright (c) 2011 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 "ui/aura/desktop.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "ui/aura/desktop_delegate.h"
@@ skipping 80 matching lines @@
 }
 
 bool Desktop::OnKeyEvent(const KeyEvent& event) {
   return window_->HandleKeyEvent(event);
 }
 
 void Desktop::OnHostResized(const gfx::Size& size) {
   gfx::Rect bounds(0, 0, size.width(), size.height());
   compositor_->WidgetSizeChanged(size);
   window_->SetBounds(bounds);
+  FOR_EACH_OBSERVER(Observer, observers_, OnDesktopResized(size));
 }
 
 void Desktop::ScheduleDraw() {
   if (!schedule_paint_factory_.HasWeakPtrs()) {
     MessageLoop::current()->PostTask(
         FROM_HERE,
         base::Bind(&Desktop::Draw, schedule_paint_factory_.GetWeakPtr()));
   }
 }
 
@@ skipping 46 matching lines @@
   // Reset active_window_ before invoking SetActiveWindow so that we don't
   // attempt to notify it while running its destructor.
   active_window_ = NULL;
   SetActiveWindow(delegate_->GetTopmostWindowToActivate(window), NULL);
 }
 
 MessageLoop::Dispatcher* Desktop::GetDispatcher() {
   return host_.get();
 }
 
+void Desktop::AddObserver(Desktop::Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void Desktop::RemoveObserver(Desktop::Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+bool Desktop::HasObserver(Desktop::Observer* observer) {
+  return observers_.HasObserver(observer);
+}
+
 // static
 Desktop* Desktop::GetInstance() {
   if (!instance_) {
     instance_ = new Desktop;
     instance_->Init();
   }
   return instance_;
 }
 
 }  // namespace aura