Add parsing code for TBSCertificate's "validity" field.

net/data/parse_certificate_unittest/tbs_v2_issuer_unique_id.pem

Index: net/data/parse_certificate_unittest/tbs_v2_issuer_unique_id.pem
diff --git a/net/data/parse_certificate_unittest/tbs_v2_issuer_unique_id.pem b/net/data/parse_certificate_unittest/tbs_v2_issuer_unique_id.pem
index 4acabd3e0d4f5ca88249248cd480b0407a66a734..c608bb4cc1de3db93e43242977929ddd13388c22 100644
--- a/net/data/parse_certificate_unittest/tbs_v2_issuer_unique_id.pem
+++ b/net/data/parse_certificate_unittest/tbs_v2_issuer_unique_id.pem
@@ -3,11 +3,12 @@ This is a version 2 certificate containing the issuer unique ID field.
 
 
 -----BEGIN TBS CERTIFICATE-----
-MCWgAwIBAQIBATADBAEBMAMEAQUwAwQBCDADBAEKMAMEAfOBAgC5
+MECgAwIBAQIBATADBAEBMAMEAQUwHhcNMTIxMDE4MDMxMjAwWhcNMTMxMDE4MTQ1OTU5WjADBAG
+DMAMEAfOBAgC5
 -----END TBS CERTIFICATE-----
 
 $ openssl asn1parse -i < [TBS CERTIFICATE]
-    0:d=0  hl=2 l=  37 cons: SEQUENCE          
+    0:d=0  hl=2 l=  64 cons: SEQUENCE          
     2:d=1  hl=2 l=   3 cons:  cont [ 0 ]        
     4:d=2  hl=2 l=   1 prim:   INTEGER           :01
     7:d=1  hl=2 l=   1 prim:  INTEGER           :01
@@ -15,14 +16,14 @@ $ openssl asn1parse -i < [TBS CERTIFICATE]
    12:d=2  hl=2 l=   1 prim:   OCTET STRING      [HEX DUMP]:01
    15:d=1  hl=2 l=   3 cons:  SEQUENCE          
    17:d=2  hl=2 l=   1 prim:   OCTET STRING      [HEX DUMP]:05
-   20:d=1  hl=2 l=   3 cons:  SEQUENCE          
-   22:d=2  hl=2 l=   1 prim:   OCTET STRING      [HEX DUMP]:08
-   25:d=1  hl=2 l=   3 cons:  SEQUENCE          
-   27:d=2  hl=2 l=   1 prim:   OCTET STRING      :
-
-   30:d=1  hl=2 l=   3 cons:  SEQUENCE          
-   32:d=2  hl=2 l=   1 prim:   OCTET STRING      [HEX DUMP]:F3
-   35:d=1  hl=2 l=   2 prim:  cont [ 1 ]        
+   20:d=1  hl=2 l=  30 cons:  SEQUENCE          
+   22:d=2  hl=2 l=  13 prim:   UTCTIME           :121018031200Z
+   37:d=2  hl=2 l=  13 prim:   UTCTIME           :131018145959Z
+   52:d=1  hl=2 l=   3 cons:  SEQUENCE          
+   54:d=2  hl=2 l=   1 prim:   OCTET STRING      [HEX DUMP]:83
+   57:d=1  hl=2 l=   3 cons:  SEQUENCE          
+   59:d=2  hl=2 l=   1 prim:   OCTET STRING      [HEX DUMP]:F3
+   62:d=1  hl=2 l=   2 prim:  cont [ 1 ]        
 
 
 
@@ -52,23 +53,31 @@ $ openssl asn1parse -i < [ISSUER]
 
 
 
------BEGIN VALIDITY-----
-MAMEAQg=
------END VALIDITY-----
+-----BEGIN VALIDITY NOTBEFORE-----
+eWVhcj0yMDEyLCBtb250aD0xMCwgZGF5PTE4LCBob3Vycz0zLCBtaW51dGVzPTEyLCBzZWNvbmR
+zPTA=
+-----END VALIDITY NOTBEFORE-----
 
-$ openssl asn1parse -i < [VALIDITY]
-    0:d=0  hl=2 l=   3 cons: SEQUENCE          
-    2:d=1  hl=2 l=   1 prim:  OCTET STRING      [HEX DUMP]:08
+VALIDITY NOTBEFORE: year=2012, month=10, day=18, hours=3, minutes=12, seconds=0
+
+
+
+-----BEGIN VALIDITY NOTAFTER-----
+eWVhcj0yMDEzLCBtb250aD0xMCwgZGF5PTE4LCBob3Vycz0xNCwgbWludXRlcz01OSwgc2Vjb25
+kcz01OQ==
+-----END VALIDITY NOTAFTER-----
+
+VALIDITY NOTAFTER: year=2013, month=10, day=18, hours=14, minutes=59, seconds=59
 
 
 
 -----BEGIN SUBJECT-----
-MAMEAQo=
+MAMEAYM=
 -----END SUBJECT-----
 
 $ openssl asn1parse -i < [SUBJECT]
     0:d=0  hl=2 l=   3 cons: SEQUENCE          
-    2:d=1  hl=2 l=   1 prim:  OCTET STRING      :
+    2:d=1  hl=2 l=   1 prim:  OCTET STRING      [HEX DUMP]:83