Use a distinct source parameter on gaia endpoints for the reconcilor.

chrome/browser/extensions/api/identity/gaia_web_auth_flow.cc

Index: chrome/browser/extensions/api/identity/gaia_web_auth_flow.cc
diff --git a/chrome/browser/extensions/api/identity/gaia_web_auth_flow.cc b/chrome/browser/extensions/api/identity/gaia_web_auth_flow.cc
index 1c82911a04d7b6872aeff57d7a4565f9913338ff..16a4e12aa76fb6b9504299b726f97dff9b5acff5 100644
--- a/chrome/browser/extensions/api/identity/gaia_web_auth_flow.cc
+++ b/chrome/browser/extensions/api/identity/gaia_web_auth_flow.cc
@@ -14,6 +14,7 @@
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "components/signin/core/browser/profile_oauth2_token_service.h"
 #include "components/signin/core/browser/signin_manager.h"
+#include "google_apis/gaia/gaia_constants.h"
 #include "google_apis/gaia/gaia_urls.h"
 #include "net/base/escape.h"
 
@@ -77,6 +78,7 @@ void GaiaWebAuthFlow::Start() {
       ProfileOAuth2TokenServiceFactory::GetForProfile(profile_);
   ubertoken_fetcher_.reset(new UbertokenFetcher(token_service,
                                                 this,
+                                                GaiaConstants::kChromeSource,

[Mike Lerman, 2014/09/26 16:57:07]

Should this be a distinct constant like kChromeExtensionSource?

[Roger Tawa OOO till Jul 10th, 2014/09/26 19:42:39]

For now I want to separate reconcilor from everything else.  Changing these
names needs to be coordinated with the gaia folks, so we should make sure we
actually need this.  At least this CL puts in place the infra for doing so
later.

                                                 profile_->GetRequestContext()));
   ubertoken_fetcher_->StartFetchingToken(account_id_);
 }