Histogram the scheme of an origin on the 1st navigation to it.

chrome/browser/tab_contents/navigation_metrics_recorder.cc

Index: chrome/browser/tab_contents/navigation_metrics_recorder.cc
diff --git a/chrome/browser/tab_contents/navigation_metrics_recorder.cc b/chrome/browser/tab_contents/navigation_metrics_recorder.cc
index 8ee3fdd80a8aeb4aae3ec7fd496eb3e746a524c9..f5078585f7233a141a98cbc612e76b17bc65c4f5 100644
--- a/chrome/browser/tab_contents/navigation_metrics_recorder.cc
+++ b/chrome/browser/tab_contents/navigation_metrics_recorder.cc
@@ -7,8 +7,11 @@
 #include "base/metrics/histogram_macros.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/tab_contents/origins_seen_service.h"
+#include "chrome/browser/tab_contents/origins_seen_service_factory.h"
 #include "components/navigation_metrics/navigation_metrics.h"
 #include "components/rappor/rappor_utils.h"
+#include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/navigation_entry.h"
@@ -17,6 +20,7 @@
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/common/frame_navigate_params.h"
 #include "url/gurl.h"
+#include "url/origin.h"
 
 #if defined(OS_WIN)
 #include "base/win/windows_version.h"
@@ -36,8 +40,17 @@ void NavigationMetricsRecorder::DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  navigation_metrics::RecordMainFrameNavigation(details.entry->GetVirtualURL(),
-                                                details.is_in_page);
+
+  content::BrowserContext* context = web_contents()->GetBrowserContext();
+  OriginsSeenService* service =
+      OriginsSeenServiceFactory::GetForBrowserContext(context);
+  const url::Origin origin(details.entry->GetVirtualURL());
+  bool have_already_seen_origin = service->Insert(origin);
+
+  navigation_metrics::RecordMainFrameNavigation(
+      details.entry->GetVirtualURL(), details.is_in_page,
+      context->IsOffTheRecord(), have_already_seen_origin);
+
   // Record the domain and registry of the URL that resulted in a navigation to
   // a |data:| URL, either by redirects or user clicking a link.
   if (details.entry->GetVirtualURL().SchemeIs(url::kDataScheme) &&