ntp_snippets: default to staging API on dev/canary

components/ntp_snippets/remote/remote_suggestions_fetcher.h

 // Copyright 2016 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_NTP_SNIPPETS_REMOTE_REMOTE_SUGGESTIONS_FETCHER_H_
 #define COMPONENTS_NTP_SNIPPETS_REMOTE_REMOTE_SUGGESTIONS_FETCHER_H_
 
 #include <memory>
 #include <queue>
 #include <string>
@@ skipping 18 matching lines @@
 class SigninManagerBase;
 
 namespace base {
 class Value;
 }  // namespace base
 
 namespace ntp_snippets {
 
 class UserClassifier;
 
+// Returns the appropriate API endpoint for the fetcher, in consideration of
+// the channel and variation parameters.
+std::string GetFetchEndpoint(bool is_stable_or_beta_channel);
+
 // TODO(tschumann): BuildArticleCategoryInfo() and BuildRemoteCategoryInfo()
 // don't really belong into this library. However, as the fetcher is
 // providing this data for server-defined remote sections it's a good starting
 // point. Candiates to add to such a library would be persisting categories
 // (have all category managment in one place) or turning parsed JSON into
 // FetchedCategory objects (all domain-specific logic in one place).
 
 // Provides the CategoryInfo data for article suggestions. If |title| is
 // nullopt, then the default, hard-coded title will be used.
 CategoryInfo BuildArticleCategoryInfo(
@@ skipping 27 matching lines @@
       base::OnceCallback<void(Status status,
                               OptionalFetchedCategories fetched_categories)>;
 
   RemoteSuggestionsFetcher(
       SigninManagerBase* signin_manager,
       OAuth2TokenService* token_service,
       scoped_refptr<net::URLRequestContextGetter> url_request_context_getter,
       PrefService* pref_service,
       translate::LanguageModel* language_model,
       const ParseJSONCallback& parse_json_callback,
+      const std::string& api_endpoint,
       const std::string& api_key,
       const UserClassifier* user_classifier);
   ~RemoteSuggestionsFetcher() override;
 
   // Initiates a fetch from the server. When done (successfully or not), calls
   // the callback.
   //
   // If an ongoing fetch exists, both fetches won't influence each other (i.e.
   // every callback will be called exactly once).
   void FetchSnippets(const RequestParams& params,
@@ skipping 111 matching lines @@
   // Info on the last finished fetch.
   std::string last_status_;
   std::string last_fetch_json_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteSuggestionsFetcher);
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_REMOTE_REMOTE_SUGGESTIONS_FETCHER_H_