Show message to indicate that mirriring with more than 3 display is not supported.

ash/display/display_manager_unittest.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 "ash/display/display_manager.h"
 
 #include "ash/accelerators/accelerator_commands.h"
 #include "ash/ash_switches.h"
+#include "ash/display/display_configuration_controller.h"
 #include "ash/display/display_info.h"
 #include "ash/display/display_layout_store.h"
 #include "ash/display/display_util.h"
 #include "ash/display/mirror_window_controller.h"
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/screen_util.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/display_manager_test_api.h"
 #include "ash/test/mirror_window_test_api.h"
 #include "ash/wm/common/window_state.h"
 #include "ash/wm/window_state_aura.h"
 #include "base/command_line.h"
 #include "base/format_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
+#include "grit/ash_strings.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window_observer.h"
 #include "ui/aura/window_tree_host.h"
+#include "ui/base/l10n/l10n_util.h"
 #include "ui/display/display.h"
 #include "ui/display/display_observer.h"
 #include "ui/display/manager/display_layout_builder.h"
 #include "ui/display/screen.h"
 #include "ui/events/test/event_generator.h"
 #include "ui/gfx/font_render_params.h"
 
 namespace ash {
 
 using std::vector;
@@ skipping 407 matching lines @@
     EXPECT_EQ("-280,680 320x200",
               display_manager()->GetDisplayAt(1).bounds().ToString());
   }
 }
 
 TEST_F(DisplayManagerTest, NoMirrorInThreeDisplays) {
   if (!SupportsMultipleDisplays())
     return;
 
   UpdateDisplay("640x480,320x200,400x300");
-  display_manager()->SetMirrorMode(true);
+  ash::Shell::GetInstance()->display_configuration_controller()->SetMirrorMode(
+      true, true);
   EXPECT_FALSE(display_manager()->IsInMirrorMode());
   EXPECT_EQ(3u, display_manager()->GetNumDisplays());
+#if defined(OS_CHROMEOS)
+  EXPECT_EQ(l10n_util::GetStringUTF16(IDS_ASH_DISPLAY_MIRRORING_NOT_SUPPORTED),
+            GetDisplayErrorNotificationMessageForTest());
+#endif
 }
 
 TEST_F(DisplayManagerTest, OverscanInsetsTest) {
   if (!SupportsMultipleDisplays())
     return;
 
   UpdateDisplay("0+0-500x500,0+501-400x400");
   reset();
   ASSERT_EQ(2u, display_manager()->GetNumDisplays());
   const DisplayInfo& display_info1 = GetDisplayInfoAt(0);
@@ skipping 1830 matching lines @@
   const display::DisplayLayout& stored =
       layout_store->GetRegisteredDisplayLayout(list);
 
   EXPECT_EQ(id1, stored.placement_list[0].parent_display_id);
   EXPECT_EQ(id2, stored.placement_list[0].display_id);
 }
 
 #endif  // OS_CHROMEOS
 
 }  // namespace ash