Distinguish STS observation times from PKP observation times.

net/http/transport_security_state.h

Index: net/http/transport_security_state.h
diff --git a/net/http/transport_security_state.h b/net/http/transport_security_state.h
index ccbc53a087dce599fef077399374ca21efe2506f..c112c735a2195b7e63b99eccd3f85c82135f9de4 100644
--- a/net/http/transport_security_state.h
+++ b/net/http/transport_security_state.h
@@ -95,10 +95,16 @@ class NET_EXPORT TransportSecurityState
 
     UpgradeMode upgrade_mode;
 
-    // The absolute time (UTC) when this DomainState was first created.
+    // The absolute time (UTC) when the |upgrade_mode| was observed.
     //
-    // Static entries do not have a created time.
-    base::Time created;
+    // TODO(palmer): Perhaps static entries should have an "observed" time.
+    base::Time sts_observed;
+
+    // The absolute time (UTC) when the |dynamic_spki_hashes| (and other
+    // |dynamic_*| state) were observed.
+    //
+    // TODO(palmer): Perhaps static entries should have an "observed" time.
+    base::Time pkp_observed;
 
     // The absolute time (UTC) when the |upgrade_mode|, if set to
     // UPGRADE_ALWAYS, downgrades to UPGRADE_NEVER.