Avoid trying to layout the desktop when its size is set to 0x0 when minimized on Windows.

ui/aura/window_unittest.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/window.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/stringprintf.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 486 matching lines @@
 
 // Verifies that when WindowDelegate::OnLostActive is invoked the window is not
 // active.
 TEST_F(WindowTest, NotActiveInLostActive) {
   Desktop* desktop = Desktop::GetInstance();
 
   ActiveWindowDelegate d1;
   scoped_ptr<Window> w1(
       CreateTestWindowWithDelegate(&d1, 1, gfx::Rect(10, 10, 50, 50), NULL));
   d1.set_window(w1.get());
+  scoped_ptr<Window> w2(
+      CreateTestWindowWithDelegate(NULL, 1, gfx::Rect(10, 10, 50, 50), NULL));
 
   // Activate w1.
   desktop->SetActiveWindow(w1.get(), NULL);
   EXPECT_EQ(w1.get(), desktop->active_window());
 
   // Should not have gotten a OnLostActive yet.
   EXPECT_EQ(0, d1.hit_count());
 
-  // Change the active window to NULL.
+  // SetActiveWindow(NULL) should not change the active window.
   desktop->SetActiveWindow(NULL, NULL);
-  EXPECT_TRUE(desktop->active_window() == NULL);
+  EXPECT_TRUE(desktop->active_window() == w1.get());
+
+  // Now activate another window.
+  desktop->SetActiveWindow(w2.get(), NULL);
 
   // Should have gotten OnLostActive and w1 should not have been active at that
   // time.
   EXPECT_EQ(1, d1.hit_count());
   EXPECT_FALSE(d1.was_active());
 }
 
 // Creates a window with a delegate (w111) that can handle events at a lower
 // z-index than a window without a delegate (w12). w12 is sized to fill the
 // entire bounds of the container. This test verifies that
@@ skipping 523 matching lines @@
 
   w3->Activate();
   EXPECT_EQ(w2.get(), active());
 
   w1->Activate();
   EXPECT_EQ(w1.get(), active());
 }
 
 }  // namespace test
 }  // namespace aura