Surface enabling ARC for child accounts in chrome://flags.

This does not enable the whole feature, which also requires being in a
server-side whitelist.

Bug: 836246
Change-Id: I6be61a5a18ba1e102d9dceaf801ecdf24931dd9d
Reviewed-on: https://chromium-review.googlesource.com/1088930
Reviewed-by: Yury Khmel <[email protected]>
Commit-Queue: Bruno Kim Medeiros Cesar <[email protected]>
Cr-Commit-Position: refs/heads/master@{#564967}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 948bea4..5dbbf85 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -1649,6 +1649,9 @@
 extern const char kAllowTouchpadThreeFingerClickName[];
 extern const char kAllowTouchpadThreeFingerClickDescription[];
 
+extern const char kArcAvailableForChildName[];
+extern const char kArcAvailableForChildDescription[];
+
 extern const char kArcBootCompleted[];
 extern const char kArcBootCompletedDescription[];