[webnfc] Add WebNFC feature flag

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 2734 matching lines @@
      flag_descriptions::kColorCorrectRenderingName,
      flag_descriptions::kColorCorrectRenderingDescription, kOsAll,
      MULTI_VALUE_TYPE(kColorCorrectRenderingChoices)},
 
 #if defined(OS_CHROMEOS)
     {"quick-unlock-pin-signin", flag_descriptions::kQuickUnlockPinSignin,
      flag_descriptions::kQuickUnlockPinSigninDescription, kOsCrOS,
      FEATURE_VALUE_TYPE(features::kQuickUnlockPinSignin)},
 #endif  // OS_CHROMEOS
 
+#if defined(OS_ANDROID)
+    {"enable-webnfc", flag_descriptions::kEnableWebNfcName,
+     flag_descriptions::kEnableWebNfcDescription, kOsAndroid,
+     FEATURE_VALUE_TYPE(features::kWebNfc)},
+#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.
 };
 
 class FlagsStateSingleton {
  public:
   FlagsStateSingleton()
       : flags_state_(kFeatureEntries, arraysize(kFeatureEntries)) {}
   ~FlagsStateSingleton() {}
@@ skipping 196 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags