Implementation of SigninClient::GetSigninScopedDeviceId

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 223fb7a0a17c31cdeab19c02b0e1141ec72721fd..78b0b1357d10724ee0fc27347e63c82a6f3291c5 100644
--- a/chrome/browser/signin/chrome_signin_client.cc
+++ b/chrome/browser/signin/chrome_signin_client.cc
@@ -4,6 +4,8 @@
 
 #include "chrome/browser/signin/chrome_signin_client.h"
 
+#include "base/guid.h"
+#include "base/prefs/pref_service.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/content_settings/cookie_settings.h"
 #include "chrome/browser/net/chrome_cookie_notification_details.h"
@@ -11,6 +13,7 @@
 #include "chrome/browser/webdata/web_data_service_factory.h"
 #include "chrome/common/chrome_version_info.h"
 #include "components/signin/core/common/profile_management_switches.h"
+#include "components/signin/core/common/signin_pref_names.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/render_process_host.h"
@@ -127,10 +130,20 @@ bool ChromeSigninClient::CanRevokeCredentials() {
 }
 
 std::string ChromeSigninClient::GetSigninScopedDeviceId() {
-  // TODO(pavely): crbug/382968. In the future this method will read
-  // SigninScopedDeviceId from prefs, generating new one if it doesn't exist.
-  // For now it returns empty string to maintain existing behavior.
-  return std::string();
+  std::string signin_scoped_device_id =
+      GetPrefs()->GetString(prefs::kGoogleServicesSigninScopedDeviceId);
+  if (signin_scoped_device_id.empty()) {
+    // If device_id doesn't exist then generate new and save in prefs.
+    signin_scoped_device_id = base::GenerateGUID();
+    DCHECK(!signin_scoped_device_id.empty());
+    GetPrefs()->SetString(prefs::kGoogleServicesSigninScopedDeviceId,
+                          signin_scoped_device_id);
+  }
+  return signin_scoped_device_id;
+}
+
+void ChromeSigninClient::ClearSigninScopedDeviceId() {
+  GetPrefs()->ClearPref(prefs::kGoogleServicesSigninScopedDeviceId);
 }
 
 net::URLRequestContextGetter* ChromeSigninClient::GetURLRequestContext() {