Make message center always scroll up upon notification removal

chrome/browser/about_flags.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 "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 28 matching lines @@
 #include "ui/gfx/switches.h"
 #include "ui/gl/gl_switches.h"
 #include "ui/keyboard/keyboard_switches.h"
 #include "ui/native_theme/native_theme_switches.h"
 #include "ui/views/views_switches.h"
 
 #if defined(OS_ANDROID)
 #include "chrome/common/chrome_version_info.h"
 #include "components/data_reduction_proxy/common/data_reduction_proxy_switches.h"
 #include "components/omnibox/omnibox_switches.h"
+#else
+#include "ui/message_center/message_center_switches.h"
 #endif
 
 #if defined(USE_ASH)
 #include "ash/ash_switches.h"
 #endif
 
 #if defined(OS_CHROMEOS)
 #include "chromeos/chromeos_switches.h"
 #include "third_party/cros_system_api/switches/chrome_switches.h"
 #endif
@@ skipping 1848 matching lines @@
     kOsWin | kOsLinux | kOsCrOS,
     SINGLE_VALUE_TYPE(extensions::switches::kEnableExtensionActionRedesign)
   },
   {
     "autofill-sync-credential",
     IDS_FLAGS_AUTOFILL_SYNC_CREDENTIAL_NAME,
     IDS_FLAGS_AUTOFILL_SYNC_CREDENTIAL_DESCRIPTION,
     kOsAll,
     MULTI_VALUE_TYPE(kAutofillSyncCredentialChoices)
   },
+#if !defined(OS_ANDROID)
+  {
+    "enable-message-center-always-scroll-up-upon-notification-removal",
+    IDS_FLAGS_ENABLE_MESSAGE_CENTER_ALWAYS_SCROLL_UP_UPON_REMOVAL_NAME,
+    IDS_FLAGS_ENABLE_MESSAGE_CENTER_ALWAYS_SCROLL_UP_UPON_REMOVAL_DESCRIPTION,
+    kOsDesktop,
+    SINGLE_VALUE_TYPE(
+        switches::kEnableMessageCenterAlwaysScrollUpUponNotificationRemoval)
+  },
+#endif
   // NOTE: Adding new command-line switches requires adding corresponding
   // entries to enum "LoginCustomFlags" in histograms.xml. See note in
   // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.
 };
 
 const Experiment* experiments = kExperiments;
 size_t num_experiments = arraysize(kExperiments);
 
 // Stores and encapsulates the little state that about:flags has.
 class FlagsState {
@@ skipping 559 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags