Connecting UserClassifier to NtpSnippetsFetcher

components/ntp_snippets/remote/ntp_snippets_fetcher.h

Index: components/ntp_snippets/remote/ntp_snippets_fetcher.h
diff --git a/components/ntp_snippets/remote/ntp_snippets_fetcher.h b/components/ntp_snippets/remote/ntp_snippets_fetcher.h
index 2d801ac25b858ac06204bfdd88b74fcdd02a8a5e..2bd661e02dde45c0f99dfd3d7071859f7c1479d5 100644
--- a/components/ntp_snippets/remote/ntp_snippets_fetcher.h
+++ b/components/ntp_snippets/remote/ntp_snippets_fetcher.h
@@ -31,6 +31,8 @@ class Value;
 
 namespace ntp_snippets {
 
+class UserClassifier;
+
 // Fetches snippet data for the NTP from the server.
 class NTPSnippetsFetcher : public OAuth2TokenService::Consumer,
                            public OAuth2TokenService::Observer,
@@ -92,7 +94,8 @@ class NTPSnippetsFetcher : public OAuth2TokenService::Consumer,
       PrefService* pref_service,
       CategoryFactory* category_factory,
       const ParseJSONCallback& parse_json_callback,
-      const std::string& api_key);
+      const std::string& api_key,
+      const UserClassifier* user_classifier);
   ~NTPSnippetsFetcher() override;
 
   // Set a callback that is called when a new set of snippets are downloaded,
@@ -165,6 +168,7 @@ class NTPSnippetsFetcher : public OAuth2TokenService::Consumer,
     std::set<std::string> excluded_ids;
     int count_to_fetch;
     bool interactive_request;
+    std::string user_class;
 
     RequestParams();
     ~RequestParams();
@@ -201,6 +205,8 @@ class NTPSnippetsFetcher : public OAuth2TokenService::Consumer,
                      FetchResult result,
                      const std::string& extra_message);
 
+  bool DemandQuotaForRequest(bool interactive_request);
+
   // Authorization for signed-in users.
   SigninManagerBase* signin_manager_;
   OAuth2TokenService* token_service_;
@@ -253,8 +259,13 @@ class NTPSnippetsFetcher : public OAuth2TokenService::Consumer,
   // Allow for an injectable tick clock for testing.
   std::unique_ptr<base::TickClock> tick_clock_;
 
-  // Request throttler for limiting requests.
-  RequestThrottler request_throttler_;
+  // Classifier that tells us how active the user is. Not owned.
+  const UserClassifier* user_classifier_;
+
+  // Request throttlers for limiting requests for different classes of users.
+  RequestThrottler request_throttler_rare_ntp_user_;
+  RequestThrottler request_throttler_active_ntp_user_;
+  RequestThrottler request_throttler_active_suggestions_consumer_;
 
   // When a token request gets canceled, we want to retry once.
   bool oauth_token_retried_;