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 a93e7fc9b0ab471f5568e8b38c206742dc1db617..5ecf4b0f5e0ee3d29655cb29ed95df7612294b54 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -267,6 +267,10 @@
 #include "services/shell/runner/common/client_util.h"
 #endif
 
+#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)

[chrisha, 2016/07/29 15:21:25]

Will this also work for ChromeOS?

[gayane -on leave until 09-2017, 2016/07/29 19:37:38]

Not sure, maybe there will be need for extra Chrome OS specific work.

+#include "chrome/browser/metrics/desktop_engagement/desktop_engagement_service.h"
+#endif
+
 using content::BrowserThread;
 
 namespace {
@@ -790,6 +794,10 @@ void ChromeBrowserMainParts::SetupMetricsAndFieldTrials() {
   // that was already chosen.
   sampling_profiler_config_.RegisterSyntheticFieldTrial();
 
+#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
+  metrics::DesktopEngagementService::Initialize();
+#endif  // defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)

[chrisha, 2016/07/29 15:21:25]

ubernit: I find the "#endif  // blah" comments useful when the #if is a ways
away (10s of lines or more), but distracting for such small one line
conditionals. YMMV.

[gayane -on leave until 09-2017, 2016/07/29 19:37:38]

Done.

+
 #if defined(OS_WIN)
   chrome_browser::SetupPreReadFieldTrial();
 #endif  // defined(OS_WIN)