Win Native Notifications: Log HRESULTs on failed showing of notification.

Bug: 860654, 734095
Change-Id: I4a705377166d9579f27206f92371c02445f2d6bf
Reviewed-on: https://chromium-review.googlesource.com/1185081Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585251}

chrome/browser/notifications/notification_platform_bridge_win.cc

@@ -15,6 +15,7 @@
 #include "base/feature_list.h"
 #include "base/hash.h"
 #include "base/logging.h"
+#include "base/metrics/histogram_functions.h"
 #include "base/sequenced_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ -701,7 +702,10 @@ class NotificationPlatformBridgeWinImpl
     HRESULT error_code;
     HRESULT hr = arguments->get_ErrorCode(&error_code);
     if (SUCCEEDED(hr)) {
+      // Error code successfully obtained from the Action Center.
       LogOnFailedStatus(OnFailedStatus::SUCCESS);
+      base::UmaHistogramSparse("Notifications.Windows.DisplayFailure",
+                               error_code);
       DLOG(ERROR) << "Failed to raise the toast notification, error code: "
                   << std::hex << error_code;
     } else {

tools/metrics/histograms/histograms.xml

@@ -63473,6 +63473,15 @@ uploading your change for review.
   </summary>
 </histogram>
 
+<histogram name="Notifications.Windows.DisplayFailure" enum="Hresult">
+  <owner>finnur@chromium.org</owner>
+  <owner>peter@chromium.org</owner>
+  <summary>
+    The HRESULT returned by the Windows Action Center, when showing a
+    notification fails.
+  </summary>
+</histogram>
+
 <histogram name="Notifications.Windows.DisplayStatus"
     enum="WindowsNotificationDisplayStatus">
   <owner>finnur@chromium.org</owner>