Enable PIN configuration settings.

BUG=603217
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation;master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2150763002
Cr-Commit-Position: refs/heads/master@{#407296}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index d7d915a..6364578 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -2015,6 +2015,9 @@
      IDS_FLAGS_FILES_QUICK_VIEW_DESCRIPTION, kOsCrOS,
      ENABLE_DISABLE_VALUE_TYPE(chromeos::switches::kEnableFilesQuickView,
                                chromeos::switches::kDisableFilesQuickView)},
+    {"quick-unlock-pin", IDS_FLAGS_QUICK_UNLOCK_PIN,
+     IDS_FLAGS_QUICK_UNLOCK_PIN_DESCRIPTION, kOsCrOS,
+     FEATURE_VALUE_TYPE(features::kQuickUnlockPin)},
 #endif  // defined(OS_CHROMEOS)
 #if defined(OS_ANDROID)
     {"multi-instance-merge-tabs", IDS_FLAGS_MULTI_INSTANCE_MERGE_TABS_NAME,