Add catalog unittests

mojo/services/catalog/store.h

Index: mojo/services/catalog/store.h
diff --git a/mojo/services/catalog/store.h b/mojo/services/catalog/store.h
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+// 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 MOJO_SERVICES_CATALOG_STORE_H_
+#define MOJO_SERVICES_CATALOG_STORE_H_
+
+#include "base/values.h"
+
+namespace catalog {
+
+// Implemented by an object that provides storage for the application catalog
+// (e.g. in Chrome, preferences). The Catalog is the canonical owner of the
+// contents of the store, so no one else must modify its contents.
+class Store {
+ public:
+  // Value is a string.
+  static const char kNameKey[];
+  // Value is a string.
+  static const char kQualifierKey[];
+  // Value is a string.
+  static const char kDisplayNameKey[];
+  // Value is a dictionary that maps from the filter to a list of string
+  // interfaces.
+  static const char kCapabilitiesKey[];
+
+  virtual ~Store() {}
+
+  // Called during initialization to construct the Catalog's catalog.
+  // Returns a serialized list of the apps. Each entry in the returned list
+  // corresponds to an app (as a dictionary). Each dictionary has a name,
+  // display name and capabilities. The return value is owned by the caller.
+  virtual const base::ListValue* GetStore() = 0;
+
+  // Write the catalog to the store. Called when the Catalog learns of a newly
+  // encountered application.
+  virtual void UpdateStore(scoped_ptr<base::ListValue> store) = 0;
+};
+
+}  // namespace catalog
+
+#endif  // MOJO_SERVICES_CATALOG_STORE_H_