Add SCT info to SSL error debugging strings.

This will display the SCT list similar to how it's displayed in
the DevTools Security Panel.

Screenshot:
https://drive.google.com/file/d/1kXpVmXspx1vzoPKjHaGDpn5rfEEc-C8a/view?usp=sharing

Bug: 845297
Change-Id: I8f028ecb5a8b0c1ff2b247c932c38bdacd9a55bc
Reviewed-on: https://chromium-review.googlesource.com/1169769
Commit-Queue: Livvie Lin <livvielin@chromium.org>
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582022}

components/security_interstitials/DEPS

@@ -9,6 +9,7 @@ include_rules = [
   "+components/grit/components_resources.h",
   "+components/url_formatter",
   "+net/base",
+  "+net/cert",
   "+net/ssl",
   "+ui/base"
 ]

components/security_interstitials/core/browser/resources/ssl.js

@@ -14,6 +14,10 @@ function setupSSLDebuggingInfo() {
   appendDebuggingField('Current date', loadTimeData.getString('currentDate'));
   appendDebuggingField('PEM encoded chain', loadTimeData.getString('pem'),
                        true);
+  var ctInfo = loadTimeData.getString('ct');
+  if (ctInfo) {
+    appendDebuggingField('Certificate Transparency', ctInfo);
+  }
 
   $('error-code').addEventListener('click', toggleDebuggingInfo);
 }

components/security_interstitials/core/common_string_util.cc

@@ -10,6 +10,7 @@
 #include "components/strings/grit/components_strings.h"
 #include "components/url_formatter/url_formatter.h"
 #include "net/base/net_errors.h"
+#include "net/cert/ct_sct_to_string.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace security_interstitials {
@@ -48,6 +49,15 @@ void PopulateSSLDebuggingStrings(const net::SSLInfo ssl_info,
       base::TimeFormatShortDate(ssl_info.cert->valid_expiry()));
   load_time_data->SetString("currentDate",
                             base::TimeFormatShortDate(time_triggered));
+  std::vector<std::string> sct_list;
+  for (const auto& sct_status : ssl_info.signed_certificate_timestamps) {
+    std::string sct_info = "\n\nSCT " + sct_status.sct->log_description + " (" +
+                           net::ct::OriginToString(sct_status.sct->origin) +
+                           ", " + net::ct::StatusToString(sct_status.status) +
+                           ")";
+    sct_list.push_back(sct_info);
+  }
+  load_time_data->SetString("ct", base::StrCat(sct_list));
   std::vector<std::string> encoded_chain;
   ssl_info.cert->GetPEMEncodedChain(&encoded_chain);
   load_time_data->SetString("pem", base::StrCat(encoded_chain));