Implemented sending Device ID to LSO in "oauth2/token".

The only place where Device ID is stored on Chrome OS is the local state from now on.

Order of events:
1) User logs in. There are two options:
  a) User athenticated through GAIA. We read known user device ID from local state if it exists or generate a new one if it doesn't. Then we save the device ID in a user context.
  b) Otherwise, we don't store device ID in user context.
2) If it is GAIA_WITHOUT_SAML-mode, we send device ID to LSO in "oauth2/token" request (OAuth2TokenInitializer class). If it is not, we'll send it in "o/oauth2/programmatic_auth" request on step (5).
3) After NotifyUserLoggedIn() call, we store the device ID from the user context (if it is set) to local state. Then we start to create/load a profile for the user.
4) In constructor of ChromeSinginClient we migrate device id from kGoogleServicesSigninScopedDeviceId pref to the local state, if a value in the local state is empty.
5) We request tokens with "o/oauth2/programmatic_auth" if we haven't done that on step (2). Old code for sending device ID works here, because it relies on ChromeSigninClient which returns device ID set on step (4).

BUG=486044,486136

Review URL: https://codereview.chromium.org/1138143002

Cr-Commit-Position: refs/heads/master@{#330207}

1 files changed, 4 insertions, 0 deletions

diff --git a/components/user_manager/user_manager_base.cc b/components/user_manager/user_manager_base.cc
index 8b1feae..3e11ff8 100644
--- a/components/user_manager/user_manager_base.cc
+++ b/components/user_manager/user_manager_base.cc
@@ -1148,6 +1148,10 @@ bool UserManagerBase::FindGaiaID(const UserID& user_id,
 
 void UserManagerBase::SetKnownUserDeviceId(const UserID& user_id,
                                            const std::string& device_id) {
+  const std::string known_device_id = GetKnownUserDeviceId(user_id);
+  if (!known_device_id.empty() && device_id != known_device_id) {
+    NOTREACHED() << "Trying to change device ID for known user.";
+  }
   SetKnownUserStringPref(user_id, kDeviceId, device_id);
 }