[Sharesheet] Record ShareAction invocations.

Bug: 1148694
Change-Id: I2843e2c39c3ad5229b45b5889a76cb93b1795689
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537505
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Auto-Submit: Melissa Zhang <melzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827325}

chrome/browser/sharesheet/sharesheet_metrics.h

@@ -14,7 +14,8 @@ class SharesheetMetrics {
   enum class UserAction {
     kCancelled = 0,  // User cancelled sharesheet.
     kArc,            // Opened an ARC app.
-    kMaxValue = kArc,
+    kAction,         // User selected an action.
+    kMaxValue = kAction,
   };
 
   SharesheetMetrics();

chrome/browser/sharesheet/sharesheet_service.cc

@@ -86,6 +86,8 @@ void SharesheetService::OnTargetSelected(uint32_t delegate_id,
         sharesheet_action_cache_->GetActionFromName(target_name);
     if (share_action == nullptr)
       return;
+    sharesheet::SharesheetMetrics::RecordSharesheetActionMetrics(
+        sharesheet::SharesheetMetrics::UserAction::kAction);
     delegate->OnActionLaunched();
     share_action->LaunchAction(delegate, share_action_view, std::move(intent));
   } else if (type == TargetType::kApp) {