Add ContentSuggestion, ContentSuggestionCategory and ContentSuggestionProviderType

components/ntp_snippets/content_suggestion.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_suggestion.h"
+
+namespace ntp_snippets {
+
+ContentSuggestion::ContentSuggestion(
+    const std::string& id,
+    const ContentSuggestionsProviderType provider,
+    const ContentSuggestionCategory category,
+    const GURL& url)
+    : id_(id), provider_(provider), category_(category), url_(url), score_(0) {}
+
+ContentSuggestion::~ContentSuggestion() {}
+
+}  // namespace ntp_snippets