[PhysicalWeb] Add fake data source and helpers for testing.

components/physical_web/data_source/fake_physical_web_data_source.h

Index: components/physical_web/data_source/fake_physical_web_data_source.h
diff --git a/components/physical_web/data_source/fake_physical_web_data_source.h b/components/physical_web/data_source/fake_physical_web_data_source.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 COMPONENTS_PHYSICAL_WEB_DATA_SOURCE_FAKE_PHYSICAL_WEB_DATA_SOURCE_H_
+#define COMPONENTS_PHYSICAL_WEB_DATA_SOURCE_FAKE_PHYSICAL_WEB_DATA_SOURCE_H_
+
+#include <memory>
+
+#include "base/memory/ptr_util.h"
+#include "base/observer_list.h"
+#include "components/physical_web/data_source/physical_web_data_source.h"
+
+namespace base {
+class DictionaryValue;
+class ListValue;
+}
+
+namespace physical_web {
+
+std::unique_ptr<base::DictionaryValue> CreatePhysicalWebPage(
+    const std::string& resolved_url,
+    double distance_estimate,
+    int scan_timestamp,
+    const std::string& title,
+    const std::string& description,
+    const std::string& scanned_url);
+
+std::unique_ptr<base::DictionaryValue>
+CreateDummyPhysicalWebPage(int id, double distance, int timestamp);
+
+std::unique_ptr<base::ListValue> CreateDummyPhysicalWebPages(
+    const std::vector<int>& ids);
+
+class FakePhysicalWebDataSource : public PhysicalWebDataSource {
+ public:
+  FakePhysicalWebDataSource();
+  ~FakePhysicalWebDataSource() override;
+
+  void StartDiscovery(bool network_request_enabled) override;
+  void StopDiscovery() override;
+
+  std::unique_ptr<base::ListValue> GetMetadata() override;
+
+  bool HasUnresolvedDiscoveries() override;
+
+  void RegisterListener(PhysicalWebListener* physical_web_listener) override;
+  void UnregisterListener(PhysicalWebListener* physical_web_listener) override;
+
+  // for testing
+  void SetMetadata(std::unique_ptr<base::ListValue> metadata);
+  void NotifyOnFound(const std::string& url);
+  void NotifyOnLost(const std::string& url);
+  void NotifyOnDistanceChanged(const std::string& url,
+                               double distance_estimate);
+
+ private:
+  std::unique_ptr<base::ListValue> metadata_;
+  base::ObserverList<PhysicalWebListener> observer_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakePhysicalWebDataSource);
+};
+
+}  // namespace physical_web
+
+#endif  // COMPONENTS_PHYSICAL_WEB_DATA_SOURCE_FAKE_PHYSICAL_WEB_DATA_SOURCE_H_