[SendTabToSelf] Record histogram for iOS infobar.

Record when the infobar is shown, opened and dismissed.

Bug: 942747
Change-Id: I76b8dbfc3538d7095eb2a9f0d4e96706954c0493
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1574833
Auto-Submit: sebsg <sebsg@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Commit-Queue: sebsg <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652878}

ios/chrome/browser/send_tab_to_self/ios_send_tab_to_self_infobar_delegate.cc

@@ -9,6 +9,7 @@
 #include "base/strings/utf_string_conversions.h"
 #include "components/infobars/core/infobar.h"
 #include "components/send_tab_to_self/send_tab_to_self_entry.h"
+#include "components/send_tab_to_self/send_tab_to_self_metrics.h"
 #include "ios/chrome/grit/ios_theme_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/strings/grit/ui_strings.h"
@@ -27,6 +28,7 @@ IOSSendTabToSelfInfoBarDelegate::IOSSendTabToSelfInfoBarDelegate(
     const SendTabToSelfEntry* entry) {
   DCHECK(entry);
   entry_ = entry;
+  RecordNotificationHistogram(SendTabToSelfNotification::kShown);
 }
 
 infobars::InfoBarDelegate::InfoBarIdentifier
@@ -64,19 +66,13 @@ GURL IOSSendTabToSelfInfoBarDelegate::GetLinkURL() const {
 
 bool IOSSendTabToSelfInfoBarDelegate::LinkClicked(
     WindowOpenDisposition disposition) {
+  RecordNotificationHistogram(SendTabToSelfNotification::kOpened);
   infobar()->owner()->OpenURL(GetLinkURL(), disposition);
   return true;
 }
 
-bool IOSSendTabToSelfInfoBarDelegate::Accept() {
-  // TODO(crbug.com/944602): Implement.
-  NOTIMPLEMENTED();
-  return true;
-}
-
 bool IOSSendTabToSelfInfoBarDelegate::Cancel() {
-  // TODO(crbug.com/944602): Implement.
-  NOTIMPLEMENTED();
+  RecordNotificationHistogram(SendTabToSelfNotification::kDismissed);
   return true;
 }
 

ios/chrome/browser/send_tab_to_self/ios_send_tab_to_self_infobar_delegate.h

@@ -35,7 +35,6 @@ class IOSSendTabToSelfInfoBarDelegate : public ConfirmInfoBarDelegate {
   base::string16 GetLinkText() const override;
   GURL GetLinkURL() const override;
   bool LinkClicked(WindowOpenDisposition disposition) override;
-  bool Accept() override;
   bool Cancel() override;
 
   // The entry that was share to this device. Must outlive this instance.