Record the initial state of the Physical Web at startup

ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h

-// 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 IOS_CHROME_COMMON_PHYSICAL_WEB_IOS_CHROME_PHYSICAL_WEB_DATA_SOURCE_H_
-#define IOS_CHROME_COMMON_PHYSICAL_WEB_IOS_CHROME_PHYSICAL_WEB_DATA_SOURCE_H_
-
-#include "base/macros.h"
-#import "base/mac/scoped_nsobject.h"
-#include "components/physical_web/data_source/physical_web_data_source_impl.h"
-
-namespace base {
-class ListValue;
-}
-class PhysicalWebListener;
-
-@class PhysicalWebScanner;
-
-// iOS implementation of PhysicalWebDataSource
-class IOSChromePhysicalWebDataSource : public PhysicalWebDataSourceImpl {
- public:
-  IOSChromePhysicalWebDataSource();
-  ~IOSChromePhysicalWebDataSource() override;
-
-  // Starts scanning for Physical Web URLs. If |network_request_enabled| is
-  // true, discovered URLs will be sent to a resolution service.
-  void StartDiscovery(bool network_request_enabled) override;
-
-  // Stops scanning for Physical Web URLs and clears cached URL content.
-  void StopDiscovery() override;
-
-  // Returns a list of resolved URLs and associated page metadata. If network
-  // requests are disabled, the list will be empty.
-  std::unique_ptr<base::ListValue> GetMetadata() override;
-
-  // Returns boolean |true| if network requests are disabled and there are one
-  // or more discovered URLs that have not been sent to the resolution service.
-  bool HasUnresolvedDiscoveries() override;
-
- private:
-  // Scanner for nearby Physical Web URL devices.
-  base::scoped_nsobject<PhysicalWebScanner> scanner_;
-
-  DISALLOW_COPY_AND_ASSIGN(IOSChromePhysicalWebDataSource);
-};
-
-#endif  // IOS_CHROME_COMMON_PHYSICAL_WEB_IOS_CHROME_PHYSICAL_WEB_DATA_SOURCE_H_