Add a function for parsing RFC 5280's "Certificate".

net/net.gypi

Index: net/net.gypi
diff --git a/net/net.gypi b/net/net.gypi
index ef933fa3b429586a1975c662e79c6ba8c1592bc5..331b336f89cd7b86e677ee56a7bcaaa2499ccf48 100644
--- a/net/net.gypi
+++ b/net/net.gypi
@@ -79,6 +79,8 @@
       'cert/ct_verify_result.h',
       'cert/internal/extended_key_usage.cc',
       'cert/internal/extended_key_usage.h',
+      'cert/internal/parse_certificate.cc',
+      'cert/internal/parse_certificate.h',
       'cert/internal/signature_algorithm.cc',
       'cert/internal/signature_algorithm.h',
       'cert/internal/signature_policy.cc',
@@ -1371,6 +1373,7 @@
       'cert/ct_serialization_unittest.cc',
       'cert/ev_root_ca_metadata_unittest.cc',
       'cert/internal/extended_key_usage_unittest.cc',
+      'cert/internal/parse_certificate_unittest.cc',
       'cert/internal/signature_algorithm_unittest.cc',
       'cert/internal/test_helpers.cc',
       'cert/internal/test_helpers.h',