[GCM] Fix gcm login to properly identify chrome

google_apis/gcm/engine/mcs_client.h

Index: google_apis/gcm/engine/mcs_client.h
diff --git a/google_apis/gcm/engine/mcs_client.h b/google_apis/gcm/engine/mcs_client.h
index 1834b9561c56d513030de81d3915eb7a86b8ab79..a81643bf9b9e10ab848fd6f6887e828fcf225365 100644
--- a/google_apis/gcm/engine/mcs_client.h
+++ b/google_apis/gcm/engine/mcs_client.h
@@ -84,7 +84,8 @@ class GCM_EXPORT MCSClient {
            const std::string& message_id,
            MessageSendStatus status)> OnMessageSentCallback;
 
-  MCSClient(base::Clock* clock,
+  MCSClient(const std::string& version_string,
+            base::Clock* clock,
             ConnectionFactory* connection_factory,
             GCMStore* gcm_store);
   virtual ~MCSClient();
@@ -197,6 +198,9 @@ class GCM_EXPORT MCSClient {
   // any associated state).
   MCSPacketInternal PopMessageForSend();
 
+  // Local version string. Sent on login.
+  const std::string version_string_;
+
   // Clock for enforcing TTL. Passed in for testing.
   base::Clock* const clock_;