Add --ignore-certificate-errors-spki-list switch and UMA histogram.

net/BUILD.gn

Index: net/BUILD.gn
diff --git a/net/BUILD.gn b/net/BUILD.gn
index 4ff5d00b518a675464bc3c56fa2676dff07442f6..352c43ac32865bb9d4661e11bd503a201d24de4d 100644
--- a/net/BUILD.gn
+++ b/net/BUILD.gn
@@ -541,6 +541,8 @@ component("net") {
       "cert/ct_signed_certificate_timestamp_log_param.h",
       "cert/ev_root_ca_metadata.cc",
       "cert/ev_root_ca_metadata.h",
+      "cert/ignore_errors_cert_verifier.cc",
+      "cert/ignore_errors_cert_verifier.h",
       "cert/internal/cert_issuer_source_nss.cc",
       "cert/internal/cert_issuer_source_nss.h",
       "cert/internal/trust_store_mac.cc",
@@ -4097,6 +4099,7 @@ test("net_unittests") {
     "cert/ct_policy_enforcer_unittest.cc",
     "cert/ct_serialization_unittest.cc",
     "cert/ev_root_ca_metadata_unittest.cc",
+    "cert/ignore_errors_cert_verifier_unittest.cc",
     "cert/internal/cert_issuer_source_aia_unittest.cc",
     "cert/internal/cert_issuer_source_nss_unittest.cc",
     "cert/internal/cert_issuer_source_static_unittest.cc",