Desktop aura: Break aura::Window::SetParent in two.

ui/aura/test/aura_test_base.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 UI_AURA_TEST_AURA_TEST_BASE_H_
 #define UI_AURA_TEST_AURA_TEST_BASE_H_
 
 #include "base/compiler_specific.h"
 #include "base/basictypes.h"
 #include "base/message_loop.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/aura/test/aura_test_helper.h"
 
 namespace aura {
 class RootWindow;
+class Window;
 namespace test {
 
 // A base class for aura unit tests.
 // TODO(beng): Instances of this test will create and own a RootWindow.
 class AuraTestBase : public testing::Test {
  public:
   AuraTestBase();
   virtual ~AuraTestBase();
 
   // testing::Test:
   virtual void SetUp() OVERRIDE;
   virtual void TearDown() OVERRIDE;
 
+  // Creates a transient window that is transient to |parent|.
+  aura::Window* CreateTransientChild(int id, aura::Window* parent);
+
+  // Attach this to the current shell's root window.

[sky, 2012/11/27 01:45:52]

nit: 'this' -> '|window|'

+  void SetDefaultParentByPrimaryRootWindow(aura::Window* window);
+
  protected:
   void RunAllPendingInMessageLoop();
 
   RootWindow* root_window() { return helper_->root_window(); }
 
  private:
   MessageLoopForUI message_loop_;
   scoped_ptr<AuraTestHelper> helper_;
 
   DISALLOW_COPY_AND_ASSIGN(AuraTestBase);
 };
 
 }  // namespace test
 }  // namespace aura
 
 #endif  // UI_AURA_TEST_AURA_TEST_BASE_H_