linux_aura: Make combo boxes work with DesktopRootWindowHostLinux.

ui/views/widget/desktop_layout_manager.h

 // 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.
 
-#ifndef ASH_WM_ROOT_WINDOW_LAYOUT_MANAGER_H_
-#define ASH_WM_ROOT_WINDOW_LAYOUT_MANAGER_H_
+#ifndef UI_VIEWS_WIDGET_DESKTOP_LAYOUT_MANAGER_H_
+#define UI_VIEWS_WIDGET_DESKTOP_LAYOUT_MANAGER_H_
 
-#include "ash/shell_window_ids.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/aura/layout_manager.h"
+#include "ui/views/views_export.h"
 
 namespace aura {
+class RootWindow;
 class Window;
 }
-namespace gfx {
-class Rect;
-}
-namespace ui {
-class Layer;
-}
+
 namespace views {
-class Widget;
-}
 
-namespace ash {
-namespace internal {
-
-// A layout manager for the root window.
-// Resizes all of its immediate children to fill the bounds of the root window.
-class RootWindowLayoutManager : public aura::LayoutManager {
+// A LayoutManager that by default makes the first Window added to a
+// RootWindow the full size, and will be resized as the RootWindow is resized.
+class VIEWS_EXPORT DesktopLayoutManager : public aura::LayoutManager {
  public:
-  explicit RootWindowLayoutManager(aura::Window* owner);
-  virtual ~RootWindowLayoutManager();
+  explicit DesktopLayoutManager(aura::RootWindow* root_window);
+  virtual ~DesktopLayoutManager();
 
   // Overridden from aura::LayoutManager:
   virtual void OnWindowResized() OVERRIDE;
   virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE;
   virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE;
   virtual void OnWindowRemovedFromLayout(aura::Window* child) OVERRIDE;
   virtual void OnChildWindowVisibilityChanged(aura::Window* child,
                                               bool visible) OVERRIDE;
   virtual void SetChildBounds(aura::Window* child,
                               const gfx::Rect& requested_bounds) OVERRIDE;
 
  private:
-  aura::Window* owner_;
+  // Sets the size of |main_window_| to the internal bounds of |root_window_|.
+  void SetMainWindowSize();
 
-  DISALLOW_COPY_AND_ASSIGN(RootWindowLayoutManager);
+  aura::RootWindow* root_window_;
+  aura::Window* main_window_;
+
+  DISALLOW_COPY_AND_ASSIGN(DesktopLayoutManager);
 };
 
-}  // namespace internal
-}  // namespace ash
+}  // namespace views
 
-#endif  // ASH_WM_ROOT_WINDOW_LAYOUT_MANAGER_H_
+#endif  // UI_VIEWS_WIDGET_DESKTOP_LAYOUT_MANAGER_H_