Add desktop engagement metrics.

chrome/browser/chrome_browser_main.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chrome_browser_main.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <set>
@@ skipping 249 matching lines @@
 #include "chrome/browser/chrome_webusb_browser_client.h"
 #include "components/webusb/webusb_detector.h"
 #endif
 
 #if defined(MOJO_SHELL_CLIENT)
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "content/public/common/mojo_shell_connection.h"
 #include "services/shell/runner/common/client_util.h"
 #endif
 
+#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
+#include "chrome/browser/metrics/desktop_engagement/desktop_engagement_service.h"
+#endif
+
 using content::BrowserThread;
 
 namespace {
 
 // This function provides some ways to test crash and assertion handling
 // behavior of the program.
 void HandleTestParameters(const base::CommandLine& command_line) {
   // This parameter causes a null pointer crash (crash reporter trigger).
   if (command_line.HasSwitch(switches::kBrowserCrashTest)) {
     int* bad_pointer = NULL;
@@ skipping 503 matching lines @@
     case version_info::Channel::BETA:
     case version_info::Channel::STABLE:
       // Don't enable instrumentation.
       break;
   }
 
   // Register a synthetic field trial for the sampling profiler configuration
   // that was already chosen.
   sampling_profiler_config_.RegisterSyntheticFieldTrial();
 
+#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
+  // Start the DesktopEngagementService.

[Alexei Svitkine (slow), 2016/07/28 18:37:22]

This comment doesn't say much that the call below doesn't. Remove it.

[gayane -on leave until 09-2017, 2016/07/28 21:21:34]

Done.

+  metrics::DesktopEngagementService::Initialize();
+#endif  // defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
+
 #if defined(OS_WIN)
   chrome_browser::SetupPreReadFieldTrial();
 #endif  // defined(OS_WIN)
 }
 
 // ChromeBrowserMainParts: |SetupMetricsAndFieldTrials()| related --------------
 
 void ChromeBrowserMainParts::StartMetricsRecording() {
   TRACE_EVENT0("startup", "ChromeBrowserMainParts::StartMetricsRecording");
 
@@ skipping 1235 matching lines @@
   chromeos::CrosSettings::Shutdown();
 #endif  // defined(OS_CHROMEOS)
 #endif  // defined(OS_ANDROID)
 }
 
 // Public members:
 
 void ChromeBrowserMainParts::AddParts(ChromeBrowserMainExtraParts* parts) {
   chrome_extra_parts_.push_back(parts);
 }