arc: Pass auth token from Chrome to ARC instance.

chrome/browser/chromeos/login/session/user_session_manager.cc

Index: chrome/browser/chromeos/login/session/user_session_manager.cc
diff --git a/chrome/browser/chromeos/login/session/user_session_manager.cc b/chrome/browser/chromeos/login/session/user_session_manager.cc
index 0a145993d8c347da68a2f27d5198852ce6fd6ee2..64d4bac2c02605d8dd792e30e7ffad42d3995727 100644
--- a/chrome/browser/chromeos/login/session/user_session_manager.cc
+++ b/chrome/browser/chromeos/login/session/user_session_manager.cc
@@ -33,6 +33,7 @@
 #include "chrome/browser/browser_shutdown.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
+#include "chrome/browser/chromeos/arc/arc_auth_service.h"
 #include "chrome/browser/chromeos/base/locale_util.h"
 #include "chrome/browser/chromeos/boot_times_recorder.h"
 #include "chrome/browser/chromeos/first_run/first_run.h"
@@ -1145,6 +1146,7 @@ void UserSessionManager::FinalizePrepareProfile(Profile* profile) {
       DCHECK(arc::ArcServiceManager::Get());
       arc::ArcServiceManager::Get()->OnPrimaryUserProfilePrepared(
           multi_user_util::GetAccountIdFromProfile(profile));
+      arc::ArcAuthService::Get()->SetProfile(profile);

[xiyuan, 2016/01/26 23:37:05]

nit: Prefer to have something similar to
ArcServiceManager::OnPrimaryUserProfilePrepared and wrap the call in it.

[khmel, 2016/01/27 22:36:21]

Sounds better, thanks

     }
   }
 
@@ -1785,6 +1787,11 @@ bool UserSessionManager::TokenHandlesEnabled() {
 }
 
 void UserSessionManager::Shutdown() {
+  if (arc::ArcBridgeService::GetEnabled(
+          base::CommandLine::ForCurrentProcess())) {
+    DCHECK(arc::ArcServiceManager::Get());
+    arc::ArcAuthService::Get()->SetProfile(nullptr);

[xiyuan, 2016/01/26 23:37:05]

nit: Similarly, prefer to have something like ArcServiceManager::Shutdown to
wrap this. It is not obvious that SetProfile(nullptr) would call
ArcBridgeService::Get()->Shutdown().

[khmel, 2016/01/27 22:36:21]

Done.

+  }
   token_handle_fetcher_.reset();
   token_handle_util_.reset();
   first_run::GoodiesDisplayer::Delete();