Add a SetCanonicalCookie method for CookieMonster.

ios/net/cookies/cookie_store_ios_persistent.mm

Index: ios/net/cookies/cookie_store_ios_persistent.mm
diff --git a/ios/net/cookies/cookie_store_ios_persistent.mm b/ios/net/cookies/cookie_store_ios_persistent.mm
index a0ed1ada98b4f01e6c83c7d013a8772fae8d5c29..9a8527cd0f55c28cfbab8a1a5872a9f3a1d8aaaf 100644
--- a/ios/net/cookies/cookie_store_ios_persistent.mm
+++ b/ios/net/cookies/cookie_store_ios_persistent.mm
@@ -57,6 +57,18 @@ void CookieStoreIOSPersistent::SetCookieWithDetailsAsync(
       WrapSetCallback(callback));
 }
 
+void CookieStoreIOSPersistent::SetCanonicalCookieAsync(
+    std::unique_ptr<CanonicalCookie> cookie,
+    bool secure_source,
+    bool modify_http_only,
+    const SetCookiesCallback& callback) {
+  DCHECK(thread_checker().CalledOnValidThread());
+
+  cookie_monster()->SetCanonicalCookieAsync(std::move(cookie), secure_source,
+                                            modify_http_only,
+                                            WrapSetCallback(callback));
+}
+
 void CookieStoreIOSPersistent::GetCookiesWithOptionsAsync(
     const GURL& url,
     const net::CookieOptions& options,