Add webusb notification UI code

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 2049 matching lines @@
       SINGLE_VALUE_TYPE(switches::kTraceExportEventsToETW)},
 #endif  // defined(OS_WIN)
 #if defined(ENABLE_BACKGROUND)
     {"enable-push-api-background-mode",
      IDS_FLAGS_ENABLE_PUSH_API_BACKGROUND_MODE_NAME,
      IDS_FLAGS_ENABLE_PUSH_API_BACKGROUND_MODE_DESCRIPTION,
      kOsMac | kOsWin | kOsLinux,
      ENABLE_DISABLE_VALUE_TYPE(switches::kEnablePushApiBackgroundMode,
                                switches::kDisablePushApiBackgroundMode)},
 #endif  // defined(ENABLE_BACKGROUND)
+#if !defined(OS_ANDROID) && !defined(OS_IOS)
+     {"enable-webusb-notifications",
+      IDS_FLAGS_ENABLE_WEBUSB_NOTIFICATIONS_NAME,
+      IDS_FLAGS_ENABLE_WEBUSB_NOTIFICATIONS_DESCRIPTION,
+      kOsDesktop,
+      SINGLE_VALUE_TYPE(switches::kEnableWebUsbNotifications)},
+#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 622 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags