Add histogram of how often an https URL commits without a certificate.

BUG=736375

Change-Id: I109fab5e41a40ba0d6f5f478c31070d7ef4ea9df
Reviewed-on: https://chromium-review.googlesource.com/565196
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Eric Lawrence <elawrence@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485418}

content/browser/frame_host/navigation_controller_impl.cc

@@ -1000,6 +1000,11 @@ bool NavigationControllerImpl::RendererDidNavigate(
 
   NotifyNavigationEntryCommitted(details);
 
+  if (active_entry->GetURL().SchemeIs(url::kHttpsScheme)) {
+    UMA_HISTOGRAM_BOOLEAN("Navigation.SecureSchemeHasSSLStatus",
+                          !!active_entry->GetSSL().certificate);
+  }
+
   if (overriding_user_agent_changed)
     delegate_->UpdateOverridingUserAgent();
 

tools/metrics/histograms/histograms.xml

@@ -34601,6 +34601,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Navigation.SecureSchemeHasSSLStatus" enum="BooleanPresent">
+  <owner>jam@chromium.org</owner>
+  <summary>
+    True counts the events when a https URL commits with a SSL certificate.
+    False is when the certificate is missing. This should be at 100%, anything
+    less is probably a bug.
+  </summary>
+</histogram>
+
 <histogram name="Navigation.Start.RendererBrowserDifference.Negative"
     units="ms">
   <obsolete>