Linux native notifications: Add server capabilities metrics

chrome/browser/notifications/native_notification_display_service.cc

Index: chrome/browser/notifications/native_notification_display_service.cc
diff --git a/chrome/browser/notifications/native_notification_display_service.cc b/chrome/browser/notifications/native_notification_display_service.cc
index 6627fe51fba86c7a55e45de972ab81063797d44a..f81c0d5a5bf5a48dde3a6b73531f15a143073c52 100644
--- a/chrome/browser/notifications/native_notification_display_service.cc
+++ b/chrome/browser/notifications/native_notification_display_service.cc
@@ -6,6 +6,7 @@
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/strings/nullable_string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
@@ -66,6 +67,10 @@ NativeNotificationDisplayService::~NativeNotificationDisplayService() = default;
 
 void NativeNotificationDisplayService::OnNotificationPlatformBridgeReady(
     bool success) {
+  // If NotificationPlatformBridge initialization succeeded, use
+  // native notifications, otherwise fallback to using the Chrome
+  // message center.
+  UMA_HISTOGRAM_BOOLEAN("Notifications.UsingNativeNotificationCenter", success);
   if (success) {
     notification_bridge_ready_ = true;
   } else {