Add ContentSuggestion, ContentSuggestionCategory and ContentSuggestionProviderType

components/ntp_snippets/snippet.cc

Index: components/ntp_snippets/snippet.cc
diff --git a/components/ntp_snippets/snippet.cc b/components/ntp_snippets/snippet.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0f2f4735dd6331e0a7241ca51e9de703374428e1
--- /dev/null
+++ b/components/ntp_snippets/snippet.cc
@@ -0,0 +1,16 @@
+// 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/snippet.h"
+
+namespace ntp_snippets {
+
+Snippet::Snippet(const std::string& id,
+                 const SnippetProviderType provider,
+                 const SnippetCategory category)
+    : id_(id), provider_(provider), category_(category), score_(0) {}
+
+Snippet::~Snippet() {}
+
+}  // namespace ntp_snippets