[CrOS Cellular] Add flag for new cellular activation flow.

Bug: 948942
Change-Id: I0986d8ebc0509a880919e2024389fe3ca4b2e43d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1550004
Auto-Submit: Kyle Horimoto <[email protected]>
Reviewed-by: Azeem Arshad <[email protected]>
Reviewed-by: Avi Drissman <[email protected]>
Commit-Queue: Avi Drissman <[email protected]>
Cr-Commit-Position: refs/heads/master@{#647115}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 1ea838f..dbbcbf2 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1324,6 +1324,10 @@
         SINGLE_DISABLE_VALUE_TYPE(
             chromeos::switches::kDisableOfficeEditingComponentApp),
     },
+    {"updated_cellular_activation_ui",
+     flag_descriptions::kUpdatedCellularActivationUiName,
+     flag_descriptions::kUpdatedCellularActivationUiDescription, kOsCrOS,
+     FEATURE_VALUE_TYPE(chromeos::features::kUpdatedCellularActivationUi)},
     {"use_messages_google_com_domain",
      flag_descriptions::kUseMessagesGoogleComDomainName,
      flag_descriptions::kUseMessagesGoogleComDomainDescription, kOsCrOS,