Add FakeAffiliationFetcher and factory.

components/password_manager/core/browser/affiliation_fetcher.h

Index: components/password_manager/core/browser/affiliation_fetcher.h
diff --git a/components/password_manager/core/browser/affiliation_fetcher.h b/components/password_manager/core/browser/affiliation_fetcher.h
index 5bda532ccb3464a051141f522c87459cd85f2cff..408a34810a9ef4286ac27091149c72072bb8ec6e 100644
--- a/components/password_manager/core/browser/affiliation_fetcher.h
+++ b/components/password_manager/core/browser/affiliation_fetcher.h
@@ -21,6 +21,8 @@ class URLRequestContextGetter;
 
 namespace password_manager {
 
+class TestAffiliationFetcherFactory;
+
 // Fetches authoritative information regarding which facets are affiliated with
 // each other, that is, which facets belong to the same logical application.
 // See affiliation_utils.h for a definition of what this means.
@@ -39,6 +41,13 @@ class AffiliationFetcher : net::URLFetcherDelegate {
       const std::vector<FacetURI>& facet_uris,
       AffiliationFetcherDelegate* delegate);
 
+  // Sets the |factory| to be used by Create() to construct AffiliationFetcher
+  // instances. To be used only for testing.
+  //
+  // The caller must ensure that the |factory| outlives all potential Create()
+  // calls. The caller may pass in NULL to resume using the default factory.
+  static void SetFactoryForTesting(TestAffiliationFetcherFactory* factory);
+
   // Actually starts the request, and will call the delegate with the results on
   // the same thread when done. If |this| is destroyed before completion, the
   // in-flight request is cancelled, and the delegate will not be called.