Adding chrome feature for keep alive

Bug: b/4249420

Change-Id: Ib0b5969c22e49fdc8b194536cf47f5135719d425
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4440669
Reviewed-by: Andrew Rayskiy <[email protected]>
Code-Coverage: Findit <[email protected]>
Commit-Queue: Simon Hangl <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1131935}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 887e8ebf..fd359ce 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -6515,6 +6515,11 @@
 const char kPreventCloseName[] = "Prevent close";
 const char kPreventCloseDescription[] =
     "When enabled, allow-listed PWAs cannot be closed manually.";
+
+const char kKeepAliveName[] = "Keep alive";
+const char kKeepAliveDescription[] =
+    "When enabled, allow-listed PWAs will be prevented for throttling or "
+    "hibernation.";
 #endif  // BUILDFLAG(IS_CHROMEOS)
 
 #if BUILDFLAG(IS_CHROMEOS_LACROS)