[Flags] Add flag for wasm code gc

This adds a flag for garbage collection of WebAssembly code. It will be
used in a finch experiment, and expire once code GC is shipped to
stable.

[email protected]

Bug: v8:8217
Change-Id: I5ab3e230c10fbd0146019547301d24c0e5a80396
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1578540
Commit-Queue: Clemens Hammacher <[email protected]>
Reviewed-by: Jochen Eisinger <[email protected]>
Cr-Commit-Position: refs/heads/master@{#653940}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index faba529..32ff08a 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -603,6 +603,9 @@
 extern const char kEnableWasmBaselineName[];
 extern const char kEnableWasmBaselineDescription[];
 
+extern const char kEnableWasmCodeGCName[];
+extern const char kEnableWasmCodeGCDescription[];
+
 extern const char kEnableWasmCodeCacheName[];
 extern const char kEnableWasmCodeCacheDescription[];