Log User Actions from crash restore toolbar.

This CL adds user Actions for closing or tapping "Restore". These
actions are helpful for Breadcrumbs feature that attaches steps to
reproduce to crash reports.

Bug: 1046231
Change-Id: I536c0de815a0bc0e4b14afe3c35ff06bc14474ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089860
Auto-Submit: Eugene But <eugenebut@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747894}

ios/chrome/browser/crash_report/crash_restore_helper.mm

@@ -8,6 +8,8 @@
 #include <utility>
 
 #include "base/metrics/histogram_functions.h"
+#include "base/metrics/user_metrics.h"
+#include "base/metrics/user_metrics_action.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/infobars/core/confirm_infobar_delegate.h"
 #include "components/infobars/core/infobar.h"
@@ -179,6 +181,7 @@ base::string16 SessionCrashedInfoBarDelegate::GetButtonLabel(
 }
 
 bool SessionCrashedInfoBarDelegate::Accept() {
+  base::RecordAction(base::UserMetricsAction("SessionCrashedInfobarRestore"));
   NSTimeInterval duration =
       [NSDate timeIntervalSinceReferenceDate] - delegate_creation_time_;
   [ConfirmInfobarMetricsRecorder
@@ -194,6 +197,7 @@ bool SessionCrashedInfoBarDelegate::Accept() {
 }
 
 void SessionCrashedInfoBarDelegate::InfoBarDismissed() {
+  base::RecordAction(base::UserMetricsAction("SessionCrashedInfobarClose"));
   [ConfirmInfobarMetricsRecorder
       recordConfirmInfobarEvent:MobileMessagesConfirmInfobarEvents::Dismissed
           forInfobarConfirmType:InfobarConfirmType::kInfobarConfirmTypeRestore];

tools/metrics/actions/actions.xml

@@ -18812,6 +18812,24 @@ should be able to be added at any place in this file.
   </description>
 </action>
 
+<action name="SessionCrashedInfobarClose">
+  <owner>eugenebut@chromium.org</owner>
+  <owner>olivierrobin@chromium.org</owner>
+  <description>
+    Logged when user taps on close button that dismisses tab restoration UI when
+    the app was relaunched after the crash. iOS only.
+  </description>
+</action>
+
+<action name="SessionCrashedInfobarRestore">
+  <owner>eugenebut@chromium.org</owner>
+  <owner>olivierrobin@chromium.org</owner>
+  <description>
+    Logged when user taps on Restore button that restores tabs when the app was
+    relaunched after the crash. iOS only.
+  </description>
+</action>
+
 <action name="Settings.Searching">
   <owner>dschuyler@chromium.org</owner>
   <description>