Implement debugging local unlock keys in chrome://proximity-auth.

chrome/browser/signin/easy_unlock_service.cc

Index: chrome/browser/signin/easy_unlock_service.cc
diff --git a/chrome/browser/signin/easy_unlock_service.cc b/chrome/browser/signin/easy_unlock_service.cc
index 4ccbcda307e4020cac3f421746b0838d3a5579ab..0faff50b9f1fe1513dbaf256afa48b80beecd6ce 100644
--- a/chrome/browser/signin/easy_unlock_service.cc
+++ b/chrome/browser/signin/easy_unlock_service.cc
@@ -288,6 +288,7 @@ void EasyUnlockService::RegisterProfilePrefs(
       false,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 
+  proximity_auth::CryptAuthGCMManager::RegisterPrefs(registry);
   proximity_auth::CryptAuthDeviceManager::RegisterPrefs(registry);
   proximity_auth::CryptAuthEnrollmentManager::RegisterPrefs(registry);
 
@@ -687,6 +688,11 @@ cryptauth::DeviceClassifier EasyUnlockService::GetDeviceClassifier() {
   return device_classifier;
 }
 
+std::string EasyUnlockService::GetAccountId() {
+  return SigninManagerFactory::GetForProfile(profile())
+      ->GetAuthenticatedAccountId();
+}
+
 gcm::GCMDriver* EasyUnlockService::GetGCMDriver() {
   gcm::GCMProfileService* gcm_profile_service =
       gcm::GCMProfileServiceFactory::GetForProfile(profile_);