[GCM] Check-in with signed in accounts associates device to user

google_apis/gcm/engine/checkin_request.cc

Index: google_apis/gcm/engine/checkin_request.cc
diff --git a/google_apis/gcm/engine/checkin_request.cc b/google_apis/gcm/engine/checkin_request.cc
index a5558471772a4043bbc0a5753d3d685678e0a6a1..5600a1c35386f0375e06552674fd970a5f2fc831 100644
--- a/google_apis/gcm/engine/checkin_request.cc
+++ b/google_apis/gcm/engine/checkin_request.cc
@@ -80,10 +80,12 @@ void RecordCheckinStatusAndReportUMA(CheckinRequestStatus status,
 CheckinRequest::RequestInfo::RequestInfo(
     uint64 android_id,
     uint64 security_token,
+    const std::map<std::string, std::string> account_tokens,
     const std::string& settings_digest,
     const checkin_proto::ChromeBuildProto& chrome_build_proto)
     : android_id(android_id),
       security_token(security_token),
+      account_tokens(account_tokens),
       settings_digest(settings_digest),
       chrome_build_proto(chrome_build_proto) {
 }
@@ -127,6 +129,16 @@ void CheckinRequest::Start() {
   checkin->set_type(checkin_proto::DEVICE_CHROME_BROWSER);
 #endif
 
+  // Pack a map of email -> token mappings into a repeated field, where odd
+  // entries are email addresses, while even ones are respective OAuth2 tokens.
+  for (std::map<std::string, std::string>::const_iterator iter =
+           request_info_.account_tokens.begin();
+       iter != request_info_.account_tokens.end();
+       ++iter) {
+    request.add_account_cookie(iter->first);
+    request.add_account_cookie(iter->second);
+  }
+
   std::string upload_data;
   CHECK(request.SerializeToString(&upload_data));