Metrics logging for user engagement of the Reload and Feedback buttons

ios/chrome/browser/ui/sad_tab/sad_tab_view.mm

Index: ios/chrome/browser/ui/sad_tab/sad_tab_view.mm
diff --git a/ios/chrome/browser/ui/sad_tab/sad_tab_view.mm b/ios/chrome/browser/ui/sad_tab/sad_tab_view.mm
index ac2fc8a36cb6f9e02791d2df7247f4c3abae99db..74486764e832460c458d7ae0ae52bee64ca61512 100644
--- a/ios/chrome/browser/ui/sad_tab/sad_tab_view.mm
+++ b/ios/chrome/browser/ui/sad_tab/sad_tab_view.mm
@@ -4,6 +4,7 @@
 
 #import "ios/chrome/browser/ui/sad_tab/sad_tab_view.h"
 
+#include "base/metrics/histogram_macros.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/grit/components_scaled_resources.h"
 #include "components/strings/grit/components_strings.h"
@@ -20,6 +21,7 @@
 #import "ios/third_party/material_roboto_font_loader_ios/src/src/MaterialRobotoFontLoader.h"
 #include "ios/web/public/navigation_manager.h"
 #include "ui/base/l10n/l10n_util.h"
+#include "ui/base/ui_metrics_types.h"
 #include "url/gurl.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ -523,9 +525,15 @@ NSString* const kMessageLabelBulletRTLFormat = @"\u202E%@\u202C";
 - (void)handleActionButtonTapped:(id)sender {
   switch (self.mode) {
     case SadTabViewMode::RELOAD:
+      UMA_HISTOGRAM_ENUMERATION(ui::kSadTabReloadHistogramKey,
+                                ui::SadTabEvent::SAD_TAB_EVENT_BUTTON_CLICKED,
+                                ui::SadTabEvent::SAD_TAB_EVENT_MAX);
       self.navigationManager->Reload(web::ReloadType::NORMAL, true);
       break;
     case SadTabViewMode::FEEDBACK: {
+      UMA_HISTOGRAM_ENUMERATION(ui::kSadTabFeedbackHistogramKey,
+                                ui::SadTabEvent::SAD_TAB_EVENT_BUTTON_CLICKED,
+                                ui::SadTabEvent::SAD_TAB_EVENT_MAX);
       GenericChromeCommand* command =
           [[GenericChromeCommand alloc] initWithTag:IDC_REPORT_AN_ISSUE];
       [self chromeExecuteCommand:command];