[MediaRouter] Record DIAL device counts in DialMediaSinkServiceImpl

chrome/browser/media/router/media_router_metrics.cc

Index: chrome/browser/media/router/media_router_metrics.cc
diff --git a/chrome/browser/media/router/media_router_metrics.cc b/chrome/browser/media/router/media_router_metrics.cc
index 3da4c634908d4ac17a1f8b82f1630b71f3d38a79..41e3997705c37d57f692b6f9aa34d8e1376468f6 100644
--- a/chrome/browser/media/router/media_router_metrics.cc
+++ b/chrome/browser/media/router/media_router_metrics.cc
@@ -10,6 +10,10 @@
 namespace media_router {
 
 // static
+const char MediaRouterMetrics::kDialAvailableDeviceCount[] =
+    "MediaRouter.Dial.AvailableDevicesCount";
+const char MediaRouterMetrics::kDialKnownDeviceCount[] =
+    "MediaRouter.Dial.KnownDevicesCount";
 const char MediaRouterMetrics::kHistogramIconClickLocation[] =
     "MediaRouter.Icon.Click.Location";
 const char MediaRouterMetrics::kHistogramUiDialogPaint[] =
@@ -63,4 +67,11 @@ void MediaRouterMetrics::RecordRouteCreationOutcome(
       static_cast<int>(MediaRouterRouteCreationOutcome::TOTAL_COUNT));
 }
 
+// static
+void MediaRouterMetrics::RecordDialDeviceCounts(size_t available_device_count,
+                                                size_t known_device_count) {
+  UMA_HISTOGRAM_COUNTS_100(kDialAvailableDeviceCount, available_device_count);
+  UMA_HISTOGRAM_COUNTS_100(kDialKnownDeviceCount, known_device_count);
+}
+
 }  // namespace media_router