Replace --add-to-shelf flag with kAppBanners feature.

chrome/common/chrome_features.cc

 // Copyright 2016 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/common/chrome_features.h"
 
 #include "base/command_line.h"
 #include "chrome/common/chrome_switches.h"
 #include "extensions/features/features.h"
 #include "ppapi/features/features.h"
@@ skipping 11 matching lines @@
 #if defined(OS_MACOSX)
 // Enables Javascript execution via AppleScript.
 const base::Feature kAppleScriptExecuteJavaScript{
     "AppleScriptExecuteJavaScript", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Use the Toolkit-Views Task Manager window.
 const base::Feature kViewsTaskManager{"ViewsTaskManager",
                                       base::FEATURE_DISABLED_BY_DEFAULT};
 #endif  // defined(OS_MACOSX)
 
+#if !defined(OS_ANDROID)
+const base::Feature kAppBanners {
+  "AppBanners",
+#if defined(OS_CHROMEOS)
+      base::FEATURE_ENABLED_BY_DEFAULT,
+#else
+      base::FEATURE_DISABLED_BY_DEFAULT,
+#endif  // defined(OS_CHROMEOS)
+};
+#endif  // !defined(OS_ANDROID)
+
 #if defined(OS_CHROMEOS)
 // Whether to handle low memory kill of ARC apps by Chrome.
 const base::Feature kArcMemoryManagement{
     "ArcMemoryManagement", base::FEATURE_ENABLED_BY_DEFAULT};
 #endif  // defined(OS_CHROMEOS)
 
 // If enabled, the list of content suggestions on the New Tab page will contain
 // assets (e.g. books, pictures, audio) that the user downloaded for later use.
 const base::Feature kAssetDownloadSuggestionsFeature{
     "NTPAssetDownloadSuggestions", base::FEATURE_ENABLED_BY_DEFAULT};
@@ skipping 352 matching lines @@
   return base::FeatureList::IsEnabled(features::kPrefService) ||
 #if BUILDFLAG(ENABLE_PACKAGE_MASH_SERVICES)
          base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
              switches::kMusConfig) == switches::kMash;
 #else
          false;
 #endif
 }
 
 }  // namespace features