Add metrics for the number of attached displays.

chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc

 // Copyright (c) 2013 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/metrics/chrome_browser_main_extra_parts_metrics.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 20 matching lines @@
 #include "base/version.h"
 #if defined(USE_X11)
 #include "ui/base/x/x11_util.h"
 #endif
 #endif  // defined(OS_LINUX) && !defined(OS_CHROMEOS)
 
 #if defined(OS_WIN)
 #include "chrome/installer/util/google_update_settings.h"
 #endif  // defined(OS_WIN)
 
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+#include "chrome/browser/metrics/chrome_browser_main_extra_parts_metrics_mac.h"
+#endif  // defined(OS_MACOSX) && !defined(OS_IOS)
+
 namespace {
 
 enum UMALinuxGlibcVersion {
   UMA_LINUX_GLIBC_NOT_PARSEABLE,
   UMA_LINUX_GLIBC_UNKNOWN,
   UMA_LINUX_GLIBC_2_11,
   UMA_LINUX_GLIBC_2_19 = UMA_LINUX_GLIBC_2_11 + 8,
   // NOTE: Add new version above this line and update the enum list in
   // tools/metrics/histograms/histograms.xml accordingly.
   UMA_LINUX_GLIBC_VERSION_COUNT
@@ skipping 185 matching lines @@
 
 void ChromeBrowserMainExtraPartsMetrics::PostBrowserStart() {
   RecordLinuxGlibcVersion();
 #if defined(USE_X11) && !defined(OS_CHROMEOS)
   UMA_HISTOGRAM_ENUMERATION("Linux.WindowManager",
                             GetLinuxWindowManager(),
                             UMA_LINUX_WINDOW_MANAGER_COUNT);
 #endif
   RecordTouchEventState();
 
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+  extra_parts_metrics_mac_.reset(new ChromeBrowserMainExtraPartsMetricsMac);
+#endif  // defined(OS_MACOSX) && !defined(OS_IOS)
+
   const int kStartupMetricsGatheringDelaySeconds = 45;
   content::BrowserThread::GetBlockingPool()->PostDelayedTask(
       FROM_HERE,
       base::Bind(&RecordStartupMetricsOnBlockingPool),
       base::TimeDelta::FromSeconds(kStartupMetricsGatheringDelaySeconds));
 }
 
 namespace chrome {
 
 void AddMetricsExtraParts(ChromeBrowserMainParts* main_parts) {
   main_parts->AddParts(new ChromeBrowserMainExtraPartsMetrics());
 }
 
 }  // namespace chrome