Add about:flags option for ProcessSharingWithDefaultSiteInstances feature.

Bug: 958060
Change-Id: Idfd80b71a15f98bef7e489900ca1a8d0a8c79ffe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1717550
Commit-Queue: Aaron Colwell <[email protected]>
Reviewed-by: Charlie Reis <[email protected]>
Cr-Commit-Position: refs/heads/master@{#680961}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 0073ac8..7ae9e48 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -1480,6 +1480,9 @@
 extern const char kPasswordManagerOnboardingAndroidName[];
 extern const char kPasswordManagerOnboardingAndroidDescription[];
 
+extern const char kProcessSharingWithDefaultSiteInstancesName[];
+extern const char kProcessSharingWithDefaultSiteInstancesDescription[];
+
 extern const char kProcessSharingWithStrictSiteInstancesName[];
 extern const char kProcessSharingWithStrictSiteInstancesDescription[];