Add chrome://enable-web-authentication-ctap2-support

This patch addes UI flag that enables by default support of CTAP2
security keys.

Bug: 780078
Change-Id: Ib182644ddf98ebc80e7ffe9fb4bc66c76c44a98b
Reviewed-on: https://chromium-review.googlesource.com/1101900
Commit-Queue: Jun Choi <[email protected]>
Reviewed-by: Kim Paulhamus <[email protected]>
Reviewed-by: Balazs Engedy <[email protected]>
Cr-Commit-Position: refs/heads/master@{#567792}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 18cd066..3cd265b 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -1551,6 +1551,9 @@
 extern const char kEnableWebAuthenticationTestingAPIName[];
 extern const char kEnableWebAuthenticationTestingAPIDescription[];
 
+extern const char kEnableWebAuthenticationCtap2SupportName[];
+extern const char kEnableWebAuthenticationCtap2SupportDescription[];
+
 #if defined(GOOGLE_CHROME_BUILD)
 
 extern const char kGoogleBrandedContextMenuName[];