linux_aura: Make combo boxes work with DesktopRootWindowHostLinux.

ui/aura/desktop/desktop_layout_manager.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 "ui/aura/desktop/desktop_layout_manager.h"
+
+#include "ui/aura/root_window.h"
+#include "ui/gfx/rect.h"
+
+namespace aura {
+
+DesktopLayoutManager::DesktopLayoutManager(RootWindow* root_window)
+    : root_window_(root_window),
+      main_window_(NULL) {
+}
+
+DesktopLayoutManager::~DesktopLayoutManager() {}
+
+void DesktopLayoutManager::OnWindowResized() {
+  if (main_window_)
+    SetMainWindowSize();
+}
+
+void DesktopLayoutManager::OnWindowAddedToLayout(Window* child) {
+  if (!main_window_) {
+    main_window_ = child;
+
+    SetMainWindowSize();
+  }
+}
+
+void DesktopLayoutManager::OnWillRemoveWindowFromLayout(Window* child) {
+  if (main_window_ == child)
+    main_window_ = NULL;
+}
+
+void DesktopLayoutManager::OnWindowRemovedFromLayout(Window* child) {
+}
+
+void DesktopLayoutManager::OnChildWindowVisibilityChanged(Window* child,
+                                                          bool visible) {
+}
+
+void DesktopLayoutManager::SetChildBounds(Window* child,
+                                          const gfx::Rect& requested_bounds) {
+  if (main_window_ != child)
+    SetChildBoundsDirect(child, requested_bounds);
+}
+
+void DesktopLayoutManager::SetMainWindowSize() {
+  gfx::Rect bounds;
+  bounds.set_size(root_window_->GetHostSize());
+  SetChildBoundsDirect(main_window_, bounds);
+}
+
+}  // namespace aura