Add multi_profile_user_count field to system_profile proto.

chrome/browser/metrics/metrics_log.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/metrics/metrics_log.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 44 matching lines @@
 #include "base/android/build_info.h"
 #endif
 
 #if defined(OS_WIN)
 #include "base/win/metro.h"
 
 // http://blogs.msdn.com/oldnewthing/archive/2004/10/25/247180.aspx
 extern "C" IMAGE_DOS_HEADER __ImageBase;
 #endif
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/login/user_manager.h"
+#endif
+
 using content::GpuDataManager;
 using metrics::OmniboxEventProto;
 using metrics::PerfDataProto;
 using metrics::ProfilerEventProto;
 using metrics::SystemProfileProto;
 using tracked_objects::ProcessDataSnapshot;
 typedef chrome_variations::ActiveGroupId ActiveGroupId;
 typedef SystemProfileProto::GoogleUpdate::ProductInfo ProductInfo;
 typedef SystemProfileProto::Hardware::Bluetooth::PairedDevice PairedDevice;
 
@@ skipping 297 matching lines @@
 }  // namespace
 
 GoogleUpdateMetrics::GoogleUpdateMetrics() : is_system_install(false) {}
 
 GoogleUpdateMetrics::~GoogleUpdateMetrics() {}
 
 static base::LazyInstance<std::string>::Leaky
   g_version_extension = LAZY_INSTANCE_INITIALIZER;
 
 MetricsLog::MetricsLog(const std::string& client_id, int session_id)
-    : MetricsLogBase(client_id, session_id, MetricsLog::GetVersionString()) {}
+    : MetricsLogBase(client_id, session_id, MetricsLog::GetVersionString()) {
+#if defined(OS_CHROMEOS)
+  initial_multi_profile_user_count_ = 0;

[Ilya Sherman, 2013/09/30 23:42:52]

nit: Please move this to the initializer list.

+  chromeos::UserManager* user_manager = chromeos::UserManager::Get();
+  if (user_manager && user_manager->IsMultipleProfilesAllowed())
+    initial_multi_profile_user_count_ = user_manager->GetLoggedInUsers().size();
+#endif
+}
 
 MetricsLog::~MetricsLog() {}
 
 // static
 void MetricsLog::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterListPref(prefs::kStabilityPluginStats);
 }
 
 // static
 int64 MetricsLog::GetIncrementalUptime(PrefService* pref) {
@@ skipping 399 matching lines @@
   if (perf_provider_.GetPerfData(&perf_data_proto))
     uma_proto()->add_perf_data()->Swap(&perf_data_proto);
 
   // BluetoothAdapterFactory::GetAdapter is synchronous on Chrome OS; if that
   // changes this will fail at the DCHECK().
   device::BluetoothAdapterFactory::GetAdapter(
       base::Bind(&MetricsLog::SetBluetoothAdapter,
                  base::Unretained(this)));
   DCHECK(adapter_.get());
   WriteBluetoothProto(hardware);
+
+  chromeos::UserManager* user_manager = chromeos::UserManager::Get();
+  if (user_manager && user_manager->IsMultipleProfilesAllowed()) {
+    int user_count = user_manager->GetLoggedInUsers().size();
+    // We invalidate the user count if it changed while the log was open.
+    if (user_count != initial_multi_profile_user_count_)
+      user_count = 0;
+    system_profile->set_multi_profile_user_count(user_count);
+  }
 #endif
 }
 
 void MetricsLog::RecordProfilerData(
     const tracked_objects::ProcessDataSnapshot& process_data,
     int process_type) {
   DCHECK(!locked());
 
   if (tracked_objects::GetTimeSourceType() !=
           tracked_objects::TIME_SOURCE_TYPE_WALL_TIME) {
@@ skipping 135 matching lines @@
 
       paired_device->set_vendor_prefix(vendor_prefix);
     }
 
     paired_device->set_vendor_id(device->GetVendorID());
     paired_device->set_product_id(device->GetProductID());
     paired_device->set_device_id(device->GetDeviceID());
   }
 #endif  // defined(OS_CHROMEOS)
 }