Add experiment to exercise AffiliationService with dummy data, plus add related UMA histograms.

components/password_manager/core/browser/affiliated_match_helper.h

Index: components/password_manager/core/browser/affiliated_match_helper.h
diff --git a/components/password_manager/core/browser/affiliated_match_helper.h b/components/password_manager/core/browser/affiliated_match_helper.h
index 7fe246d041f4162db8cad55fa5770e3a6a119e06..cc1aa57dd1dae7210b6ef89a516bbfec2e0071dc 100644
--- a/components/password_manager/core/browser/affiliated_match_helper.h
+++ b/components/password_manager/core/browser/affiliated_match_helper.h
@@ -13,6 +13,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
+#include "base/timer/timer.h"
 #include "components/password_manager/core/browser/affiliation_utils.h"
 #include "components/password_manager/core/browser/password_store.h"
 #include "components/password_manager/core/browser/password_store_consumer.h"
@@ -129,6 +130,10 @@ class AffiliatedMatchHelper : public PasswordStore::Observer,
       const AffiliatedFacets& results,
       bool success);
 
+  // Called periodically to verify that affiliation information is correctly
+  // prefetched for dummy Android applications, if the experiment is enabled.
+  void VerifyAffiliationsOfDummyFacetsPrefetched();
+
   // PasswordStore::Observer:
   void OnLoginsChanged(const PasswordStoreChangeList& changes) override;
 
@@ -142,6 +147,9 @@ class AffiliatedMatchHelper : public PasswordStore::Observer,
   // Being the sole consumer of AffiliationService, |this| owns the service.
   scoped_ptr<AffiliationService> affiliation_service_;
 
+  // Timer to periodically trigger VerifyAffiliationsOfDummyFacetsPrefetched().
+  base::RepeatingTimer<AffiliatedMatchHelper> verify_dummy_prefetch_timer_;
+
   base::WeakPtrFactory<AffiliatedMatchHelper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AffiliatedMatchHelper);