Add --enable-usermedia-screen-capturing in about:flags

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 <algorithm>
 #include <iterator>
 #include <map>
 #include <set>
@@ skipping 1278 matching lines @@
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kHistoryEnableFullHistorySync)
   },
   {
     "enable-sync-dictionary",
     IDS_FLAGS_ENABLE_SYNC_DICTIONARY_NAME,
     IDS_FLAGS_ENABLE_SYNC_DICTIONARY_DESCRIPTION,
     kOsWin | kOsCrOS | kOsLinux,
     SINGLE_VALUE_TYPE(switches::kEnableSyncDictionary)
   },
+  {
+    "enable-usermedia-screen-capture",
+    IDS_FLAGS_ENABLE_SCREEN_CAPTURE_NAME,
+    IDS_FLAGS_ENABLE_SCREEN_CAPTURE_DESCRIPTION,
+    kOsDesktop,
+    SINGLE_VALUE_TYPE(switches::kEnableUserMediaScreenCapturing)
+  },
 };
 
 const Experiment* experiments = kExperiments;
 size_t num_experiments = arraysize(kExperiments);
 
 // Stores and encapsulates the little state that about:flags has.
 class FlagsState {
  public:
   FlagsState() : needs_restart_(false) {}
   void ConvertFlagsToSwitches(PrefService* prefs, CommandLine* command_line);
@@ skipping 416 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags