NTP: Extract JSON requests from Fetcher.

components/ntp_snippets/remote/ntp_snippets_request_params.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_NTP_SNIPPETS_REQUEST_PARAMS_H_
+#define COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPETS_REQUEST_PARAMS_H_
+
+#include <set>
+#include <string>
+
+#include "base/optional.h"
+#include "components/ntp_snippets/category.h"
+
+namespace ntp_snippets {
+
+// Contains all parameters for fetching NTPSnippets.
+struct NTPSnippetsRequestParams {
+  NTPSnippetsRequestParams();
+  NTPSnippetsRequestParams(const NTPSnippetsRequestParams&);
+  ~NTPSnippetsRequestParams();
+
+  // BCP 47 language code specifying the user's UI language.
+  std::string language_code;
+
+  // A set of suggestion IDs that should not be returned again.
+  std::set<std::string> excluded_ids;
+
+  // Maximum number of snippets to fetch.
+  int count_to_fetch = 0;
+
+  // Whether this is an interactive request, i.e. triggered by an explicit
+  // user action. Typically, non-interactive requests are subject to a daily
+  // quota.
+  bool interactive_request = false;
+
+  // If set, only return results for this category.
+  base::Optional<Category> exclusive_category;
+};
+
+}  // namespace ntp_snippets
+
+#endif  // COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPETS_REQUEST_PARAMS_H_