Add ContentSuggestionsService

components/ntp_snippets/content_suggestions_provider.cc

+// 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.
+
+#include "components/ntp_snippets/content_suggestions_provider.h"
+
+#include "base/strings/stringprintf.h"
+
+namespace ntp_snippets {
+
+namespace {
+
+const char kCombinedIDFormat[] = "%d:%s";
+
+}  // namespace
+
+ContentSuggestionsProvider::ContentSuggestionsProvider(
+    const std::vector<ContentSuggestionsCategory>& provided_categories)
+    : provided_categories_(provided_categories) {}
+
+ContentSuggestionsProvider::~ContentSuggestionsProvider() {}
+
+std::string ContentSuggestionsProvider::MakeUniqueID(
+    ContentSuggestionsCategory category,
+    const std::string& within_category_id) {
+  return base::StringPrintf(kCombinedIDFormat, int(category),
+                            within_category_id.c_str());
+}
+
+}  // namespace ntp_snippets