SameSite: Implement 'Strict'/'Lax' attribute parsing.

net/cookies/canonical_cookie.h

Index: net/cookies/canonical_cookie.h
diff --git a/net/cookies/canonical_cookie.h b/net/cookies/canonical_cookie.h
index 6f43d9ea7875853108088ec1ca7486944213e348..e14cf2e7da2c42b2c03da2c1744a98bf55846293 100644
--- a/net/cookies/canonical_cookie.h
+++ b/net/cookies/canonical_cookie.h
@@ -38,7 +38,7 @@ class NET_EXPORT CanonicalCookie {
                   const base::Time& last_access,
                   bool secure,
                   bool httponly,
-                  bool same_site,
+                  CookieSameSite same_site,
                   CookiePriority priority);
 
   // This constructor does canonicalization but not validation.
@@ -72,7 +72,7 @@ class NET_EXPORT CanonicalCookie {
                                             const base::Time& expiration,
                                             bool secure,
                                             bool http_only,
-                                            bool same_site,
+                                            CookieSameSite same_site,
                                             bool enforce_strict_secure,
                                             CookiePriority priority);
 
@@ -87,7 +87,7 @@ class NET_EXPORT CanonicalCookie {
   const base::Time& ExpiryDate() const { return expiry_date_; }
   bool IsSecure() const { return secure_; }
   bool IsHttpOnly() const { return httponly_; }
-  bool IsSameSite() const { return same_site_; }
+  CookieSameSite SameSite() const { return same_site_; }
   CookiePriority Priority() const { return priority_; }
   bool IsDomainCookie() const {
     return !domain_.empty() && domain_[0] == '.'; }
@@ -206,7 +206,7 @@ class NET_EXPORT CanonicalCookie {
   base::Time last_access_date_;
   bool secure_;
   bool httponly_;
-  bool same_site_;
+  CookieSameSite same_site_;
   CookiePriority priority_;
 };