Add Navigation.MainFrameSchemeDifferentPage which excludes same-page navigations.

components/navigation_metrics/navigation_metrics.cc

Index: components/navigation_metrics/navigation_metrics.cc
diff --git a/components/navigation_metrics/navigation_metrics.cc b/components/navigation_metrics/navigation_metrics.cc
index acbe25a9b08c1fa79397679f5eadf90acd80eaf3..f7d63e48b7a96f82f62d07450e9cd302664bfd10 100644
--- a/components/navigation_metrics/navigation_metrics.cc
+++ b/components/navigation_metrics/navigation_metrics.cc
@@ -42,7 +42,7 @@ COMPILE_ASSERT(arraysize(kSchemeNames) == SCHEME_MAX + 1,
 
 namespace navigation_metrics {
 
-void RecordMainFrameNavigation(const GURL& url) {
+void RecordMainFrameNavigation(const GURL& url, bool is_in_page) {
   Scheme scheme = SCHEME_UNKNOWN;
   for (int i = 1; i < SCHEME_MAX; ++i) {
     if (url.SchemeIs(kSchemeNames[i])) {
@@ -52,6 +52,10 @@ void RecordMainFrameNavigation(const GURL& url) {
   }
   UMA_HISTOGRAM_ENUMERATION(
       "Navigation.MainFrameScheme", scheme, SCHEME_MAX);
+  if (!is_in_page) {
+    UMA_HISTOGRAM_ENUMERATION(
+        "Navigation.MainFrameSchemeDifferentPage", scheme, SCHEME_MAX);
+  }
 }
 
 }  // namespace navigation_metrics