Track when user signs in the profile.

chrome/browser/signin/chrome_signin_client.cc

Index: chrome/browser/signin/chrome_signin_client.cc
diff --git a/chrome/browser/signin/chrome_signin_client.cc b/chrome/browser/signin/chrome_signin_client.cc
index dd909b6b71a2a5334153a934e0fa000dcb7cd061..bf2c1c764c13fa7beab1954f1d855da9f7f81ece 100644
--- a/chrome/browser/signin/chrome_signin_client.cc
+++ b/chrome/browser/signin/chrome_signin_client.cc
@@ -7,12 +7,15 @@
 #include "base/command_line.h"
 #include "base/guid.h"
 #include "base/prefs/pref_service.h"
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/content_settings/cookie_settings.h"
+#include "chrome/browser/first_run/first_run.h"
 #include "chrome/browser/net/chrome_cookie_notification_details.h"
 #include "chrome/browser/signin/local_auth.h"
 #include "chrome/browser/webdata/web_data_service_factory.h"
 #include "chrome/common/chrome_version_info.h"
+#include "components/metrics/metrics_service.h"
 #include "components/signin/core/common/profile_management_switches.h"
 #include "components/signin/core/common/signin_pref_names.h"
 #include "components/signin/core/common/signin_switches.h"
@@ -176,6 +179,15 @@ std::string ChromeSigninClient::GetProductVersion() {
   return chrome_version.CreateVersionString();
 }
 
+bool ChromeSigninClient::IsFirstRun() const {
+  return first_run::IsChromeFirstRun();
+}
+
+base::Time ChromeSigninClient::GetInstallDate() {
+  return base::Time::FromTimeT(
+      g_browser_process->metrics_service()->GetInstallDate());
+}
+
 scoped_ptr<SigninClient::CookieChangedCallbackList::Subscription>
 ChromeSigninClient::AddCookieChangedCallback(
     const CookieChangedCallback& callback) {