Update Physical Web WebUI to show new results automatically

components/physical_web/webui/physical_web_base_message_handler.h

Index: components/physical_web/webui/physical_web_base_message_handler.h
diff --git a/components/physical_web/webui/physical_web_base_message_handler.h b/components/physical_web/webui/physical_web_base_message_handler.h
index 190cf294b11f142fbfe0243aebc3881a11d2cd07..d974ac2c8012eeb239ca6cce3b6fb3f3ddb1d226 100644
--- a/components/physical_web/webui/physical_web_base_message_handler.h
+++ b/components/physical_web/webui/physical_web_base_message_handler.h
@@ -5,9 +5,13 @@
 #ifndef COMPONENTS_PHYSICAL_WEB_WEBUI_PHYSICAL_WEB_BASE_MESSAGE_HANDLER_H_
 #define COMPONENTS_PHYSICAL_WEB_WEBUI_PHYSICAL_WEB_BASE_MESSAGE_HANDLER_H_
 
+#include <unordered_map>
+
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/values.h"
+#include "components/physical_web/data_source/physical_web_data_source.h"
+#include "components/physical_web/data_source/physical_web_listener.h"
 
 namespace physical_web {
 
@@ -22,11 +26,16 @@ typedef base::Callback<void(const base::ListValue*)> MessageCallback;
 
 // The base handler for Javascript messages for the chrome://physical-web page.
 // This does not implement WebUIMessageHandler or register its methods.
-class PhysicalWebBaseMessageHandler {
+class PhysicalWebBaseMessageHandler : physical_web::PhysicalWebListener {
  public:
   PhysicalWebBaseMessageHandler();
   virtual ~PhysicalWebBaseMessageHandler();
 
+  // PhysicalWebListener
+  void OnFound(const GURL& url) override;
+  void OnLost(const GURL& url) override;
+  void OnDistanceChanged(const GURL& url, double distance_estimate) override;
+
   // Handles the RequestNearbyURLs message, returning URLs that are currently
   // being broadcasted by Physical Web transports.
   void HandleRequestNearbyURLs(const base::ListValue* args);
@@ -50,6 +59,10 @@ class PhysicalWebBaseMessageHandler {
   virtual physical_web::PhysicalWebDataSource* GetPhysicalWebDataSource() = 0;
 
  private:
+  physical_web::PhysicalWebDataSource* data_source_;
+  std::vector<std::string> ordered_group_ids_;
+  std::unordered_map<std::string, physical_web::Metadata> metadata_map_;
+
   DISALLOW_COPY_AND_ASSIGN(PhysicalWebBaseMessageHandler);
 };