aura: Fix Chrome OS status area browser tests.

chrome/browser/chromeos/frame/layout_mode_button.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 "chrome/browser/chromeos/frame/layout_mode_button.h"
 
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
+#include "chrome/browser/chromeos/view_ids.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
 #include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
 #include "third_party/cros_system_api/window_manager/chromeos_wm_ipc_enums.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "views/widget/widget.h"
 
 #if defined(TOOLKIT_USES_GTK)
 #include "chrome/browser/chromeos/legacy_window_manager/wm_ipc.h"
 #endif
 
 namespace {
 const int kHorizontalPaddingPixels = 2;
 }  // namespace
 
 namespace chromeos {
 
 LayoutModeButton::LayoutModeButton()
     : ALLOW_THIS_IN_INITIALIZER_LIST(ImageButton(this)) {
+  set_id(VIEW_ID_LAYOUT_MODE_BUTTON);
 }
 
 LayoutModeButton::~LayoutModeButton() {
 }
 
 gfx::Size LayoutModeButton::GetPreferredSize() {
   gfx::Size size = ImageButton::GetPreferredSize();
   size.Enlarge(2 * kHorizontalPaddingPixels, 0);
   return size;
 }
@@ skipping 60 matching lines @@
       SetTooltipText(
           l10n_util::GetStringUTF16(IDS_STATUSBAR_WINDOW_MAXIMIZE_TOOLTIP));
       break;
     default:
       DLOG(WARNING) << "Unknown layout mode " << mode;
   }
 #endif
 }
 
 }  // namespace chromeos