Restrict transmission of external exp ids to signed in users.

components/variations/variations_associated_data.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_VARIATIONS_VARIATIONS_ASSOCIATED_DATA_H_
 #define COMPONENTS_VARIATIONS_VARIATIONS_ASSOCIATED_DATA_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 40 matching lines @@
 typedef int VariationID;
 
 const VariationID EMPTY_ID = 0;
 
 // A key into the Associate/Get methods for VariationIDs. This is used to create
 // separate ID associations for separate parties interested in VariationIDs.
 enum IDCollectionKey {
   // This collection is used by Google web properties, transmitted through the
   // X-Client-Data header.
   GOOGLE_WEB_PROPERTIES,
+  // This collected is used by Google web properties for signed in users only,

[jwd, 2016/12/12 16:04:43]

nit: collection

[Alexei Svitkine (slow), 2016/12/12 16:13:19]

Done.

+  // transmitted through the X-Client-Data header.
+  GOOGLE_WEB_PROPERTIES_SIGNED_IN,
   // This collection is used by Google web properties for IDs that trigger
   // server side experimental behavior, transmitted through the
   // X-Client-Data header.
   GOOGLE_WEB_PROPERTIES_TRIGGER,
   // This collection is used by Chrome Sync services, transmitted through the
   // Chrome Sync experiment labels.
   CHROME_SYNC_SERVICE,
   // The total count of collections.
   ID_COLLECTION_COUNT,
 };
@@ skipping 99 matching lines @@
 // Clears all of the associated params. Deprecated, try to use
 // VariationParamsManager instead as it does a lot of work for you
 // automatically.
 void ClearAllVariationParams();
 
 }  // namespace testing
 
 }  // namespace variations
 
 #endif  // COMPONENTS_VARIATIONS_VARIATIONS_ASSOCIATED_DATA_H_