[M54] Merge DesktopEngagementService fixes.

chrome/browser/metrics/desktop_engagement/chrome_visibility_observer.h

Index: chrome/browser/metrics/desktop_engagement/chrome_visibility_observer.h
diff --git a/chrome/browser/metrics/desktop_engagement/chrome_visibility_observer.h b/chrome/browser/metrics/desktop_engagement/chrome_visibility_observer.h
index 8677b432cdfa13c55448b71246d6eff100db56cc..dde1b977baa1db8e385b1dd93729e5a801cb9146 100644
--- a/chrome/browser/metrics/desktop_engagement/chrome_visibility_observer.h
+++ b/chrome/browser/metrics/desktop_engagement/chrome_visibility_observer.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_METRICS_DESKTOP_ENGAGEMENT_CHROME_VISIBILITY_OBSERVER_H_
 
 #include "base/memory/weak_ptr.h"
+#include "base/time/time.h"
 #include "chrome/browser/ui/browser_list_observer.h"
 
 namespace metrics {
@@ -19,7 +20,7 @@ class ChromeVisibilityObserver : public chrome::BrowserListObserver {
  protected:
   // Notifies |DesktopEngagementService| of visibility changes. Overridden by
   // tests.
-  virtual void SendVisibilityChangeEvent(bool active);
+  virtual void SendVisibilityChangeEvent(bool active, base::TimeDelta time_ago);
 
  private:
   // Cancels visibility change in case when the browser becomes visible after a