Add desktop engagement metrics.

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index aac3599c8dbd5968bce77d00d09f91e9845a5d0a..c7e82fed41a5b7766de40d395aea095ba96e6c8c 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -274,6 +274,11 @@
 #include "services/shell/runner/common/client_util.h"
 #endif
 
+#if defined(OS_WIN) || defined(OS_MACOSX) || \
+    (defined(OS_LINUX) && !defined(OS_CHROMEOS))
+#include "chrome/browser/metrics/desktop_engagement/desktop_engagement_service.h"
+#endif
+
 using content::BrowserThread;
 
 namespace {
@@ -797,6 +802,11 @@ void ChromeBrowserMainParts::SetupMetricsAndFieldTrials() {
   // that was already chosen.
   sampling_profiler_config_.RegisterSyntheticFieldTrial();
 
+#if defined(OS_WIN) || defined(OS_MACOSX) || \
+    (defined(OS_LINUX) && !defined(OS_CHROMEOS))
+  metrics::DesktopEngagementService::Initialize();
+#endif
+
 #if defined(OS_WIN)
   chrome_browser::SetupPreReadFieldTrial();
 #endif  // defined(OS_WIN)