capture_mode: Add the flag.

Bug: 1133762
Change-Id: I98c7f1323e46abf81b1349272cef1865b9575c05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441809
Commit-Queue: Min Chen <[email protected]>
Reviewed-by: Ahmed Fakhry <[email protected]>
Cr-Commit-Position: refs/heads/master@{#813942}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 3b282fb0..546318b 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -1173,6 +1173,9 @@
 extern const char kSchemefulSameSiteName[];
 extern const char kSchemefulSameSiteDescription[];
 
+extern const char kScreenCaptureTestName[];
+extern const char kScreenCaptureTestDescription[];
+
 extern const char kScrollableTabStripName[];
 extern const char kScrollableTabStripDescription[];