Add chrome://flags entry for --try-supported-channel-layouts

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 2450 matching lines @@
   // Temporary flag to ease the transition to standard-compliant scrollTop
   // behavior.  Will be removed shortly after http://crbug.com/157855 ships.
   {
     "scroll-top-left-interop",
     IDS_FLAGS_SCROLL_TOP_LEFT_INTEROP_NAME,
     IDS_FLAGS_SCROLL_TOP_LEFT_INTEROP_DESCRIPTION,
     kOsAll,
     ENABLE_DISABLE_VALUE_TYPE_AND_VALUE(
         switches::kEnableBlinkFeatures, "ScrollTopLeftInterop",
         switches::kDisableBlinkFeatures, "ScrollTopLeftInterop")
-  }
+  },
+#if defined(OS_WIN)
+  {
+    "try-supported-channel-layouts",
+    IDS_FLAGS_TRY_SUPPORTED_CHANNEL_LAYOUTS_NAME,
+    IDS_FLAGS_TRY_SUPPORTED_CHANNEL_LAYOUTS_DESCRIPTION,
+    kOsWin,
+    SINGLE_VALUE_TYPE(switches::kTrySupportedChannelLayouts)
+  },
+#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 568 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags