Add ContentSuggestionsService

components/ntp_snippets/content_suggestions_provider.cc

Index: components/ntp_snippets/content_suggestions_provider.cc
diff --git a/components/ntp_snippets/content_suggestions_provider.cc b/components/ntp_snippets/content_suggestions_provider.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5a106bff8db33f69dcd405088d94d1dbf389b0aa
--- /dev/null
+++ b/components/ntp_snippets/content_suggestions_provider.cc
@@ -0,0 +1,30 @@
+// 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
+
+std::string ContentSuggestionsProvider::MakeUniqueID(
+    ContentSuggestionCategory category,
+    const std::string& within_category_id) {
+  return base::StringPrintf(kCombinedIDFormat, category,
+                            within_category_id.c_str());
+}
+
+ContentSuggestionsProvider::ContentSuggestionsProvider(
+    const std::vector<ContentSuggestionCategory>& provided_categories)
+    : provided_categories_(provided_categories) {}
+
+ContentSuggestionsProvider::~ContentSuggestionsProvider() {}
+
+}  // namespace ntp_snippets