Adds metrics for opening Downloads folder.

user actions:
-Adds MobileDownloadFolderUIShownFromDownloadManager
-Adds MobileDownloadFolderUIShownFromToolsMenu

Bug: 1013572
Change-Id: Iee1697a330b37c0ca5501928f01a25ca17062140
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1970993Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Ewann Pellé <ewannpv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733948}

ios/chrome/browser/ui/download/activities/open_downloads_folder_activity.mm

@@ -4,6 +4,8 @@
 
 #import "ios/chrome/browser/ui/download/activities/open_downloads_folder_activity.h"
 
+#include "base/metrics/user_metrics.h"
+#include "base/metrics/user_metrics_action.h"
 #import "ios/chrome/browser/ui/commands/browser_commands.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ui/base/l10n/l10n_util_mac.h"
@@ -49,6 +51,8 @@ NSString* const kOpenDownloadsFolderActivityType =
 }
 
 - (void)performActivity {
+  base::RecordAction(base::UserMetricsAction(
+      "MobileDownloadFolderUIShownFromDownloadManager"));
   [self.browserHandler showDownloadsFolder];
   [self activityDidFinish:YES];
 }

ios/chrome/browser/ui/popup_menu/popup_menu_action_handler.mm

@@ -106,6 +106,8 @@ using base::UserMetricsAction;
       [self.dispatcher showHelpPage];
       break;
     case PopupMenuActionOpenDownloads:
+      RecordAction(
+          UserMetricsAction("MobileDownloadFolderUIShownFromToolsMenu"));
       [self.dispatcher showDownloadsFolder];
       break;
     case PopupMenuActionTextZoom:

tools/metrics/actions/actions.xml

@@ -12315,6 +12315,22 @@ should be able to be added at any place in this file.
   <description>User was presented with the Download file UI.</description>
 </action>
 
+<action name="MobileDownloadFolderUIShownFromDownloadManager">
+  <owner>ewannpv@chromium.org</owner>
+  <owner>gambard@chromium.org</owner>
+  <description>
+    User pressed &quot;Open in Downloads&quot; button from the download manager.
+  </description>
+</action>
+
+<action name="MobileDownloadFolderUIShownFromToolsMenu">
+  <owner>ewannpv@chromium.org</owner>
+  <owner>gambard@chromium.org</owner>
+  <description>
+    User pressed &quot;Downloads&quot; button from the tools menu.
+  </description>
+</action>
+
 <action name="MobileDownloadRetryDownload">
   <owner>eugenebut@chromium.org</owner>
   <description>