Record the initial state of the Physical Web at startup

ios/chrome/browser/physical_web/ios_chrome_physical_web_data_source.mm

 // 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.
 
-#import "ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h"
+#import "ios/chrome/browser/physical_web/ios_chrome_physical_web_data_source.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
+#import "ios/chrome/browser/physical_web/physical_web_initial_state_recorder.h"
 #import "ios/chrome/common/physical_web/physical_web_scanner.h"
 
 IOSChromePhysicalWebDataSource::IOSChromePhysicalWebDataSource() {}
 
 IOSChromePhysicalWebDataSource::~IOSChromePhysicalWebDataSource() {
   StopDiscovery();
 }
 
 void IOSChromePhysicalWebDataSource::StartDiscovery(
     bool network_request_enabled) {
@@ skipping 22 matching lines @@
 std::unique_ptr<base::ListValue> IOSChromePhysicalWebDataSource::GetMetadata() {
   if (!scanner_) {
     return base::MakeUnique<base::ListValue>();
   }
   return [scanner_ metadata];
 }
 
 bool IOSChromePhysicalWebDataSource::HasUnresolvedDiscoveries() {
   return [scanner_ unresolvedBeaconsCount] > 0;
 }
+
+void IOSChromePhysicalWebDataSource::RecordInitialState(
+    PrefService* pref_service) {
+  initialStateRecorder_.reset([[PhysicalWebInitialStateRecorder alloc]
+      initWithPrefService:pref_service]);
+  [initialStateRecorder_ collectAndRecordState];
+}