[ios] Record user action when the user taps OPEN IN...

User actions are added to breadcrumbs that get attached to crashlogs to
help with steps to repro.

Bug: 1046223
Change-Id: Icf451a5d9bb72557d18555694227dd4e4d0b23b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250705
Auto-Submit: Eugene But <eugenebut@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780395}

ios/chrome/browser/ui/open_in/open_in_controller.mm

@@ -10,6 +10,8 @@
 #include "base/logging.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/metrics/histogram_macros.h"
+#include "base/metrics/user_metrics.h"
+#include "base/metrics/user_metrics_action.h"
 #include "base/sequenced_task_runner.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/task/post_task.h"
@@ -339,6 +341,9 @@ class OpenInControllerBridge
 - (void)exportFileWithOpenInMenuAnchoredAt:(UIView*)view {
   DCHECK([view isKindOfClass:[UIView class]]);
   DCHECK_CURRENTLY_ON(web::WebThread::UI);
+
+  base::RecordAction(base::UserMetricsAction("IOS.OpenIn"));
+
   if (!_webState)
     return;
 

tools/metrics/actions/actions.xml

@@ -8614,6 +8614,15 @@ should be able to be added at any place in this file.
   </description>
 </action>
 
+<action name="IOS.OpenIn">
+  <owner>eugenebut@chromium.org</owner>
+  <owner>mrefaat@chromium.org</owner>
+  <description>
+    Recorded when the user taps on OPEN IN... button to share the page
+    (typically PDF).
+  </description>
+</action>
+
 <action name="IOS.PageZoom.ZoomIn">
   <owner>rkgibson@google.com</owner>
   <owner>gambard@chromium.org</owner>