Expose Physical Web data

components/physical_web/data_source/physical_web_listener.h

Index: components/physical_web/data_source/physical_web_listener.h
diff --git a/components/physical_web/data_source/physical_web_listener.h b/components/physical_web/data_source/physical_web_listener.h
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index 0000000000000000000000000000000000000000..4cf911a3318262acbe3d5b424e7cf647d400f99d
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+++ b/components/physical_web/data_source/physical_web_listener.h
@@ -0,0 +1,26 @@
+// 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_PHYSICAL_WEB_LISTENER_H_
+#define COMPONENTS_PHYSICAL_WEB_DATA_SOURCE_PHYSICAL_WEB_LISTENER_H_
+
+#include <string>
+
+// Class for being notified when Physical Web data changes.
+class PhysicalWebListener {

[Olivier, 2016/08/22 07:45:09]

Question: Is it possible that a beacon change URL?
In that case, do we have a Lost/Found notification?

[cco3, 2016/08/22 17:02:44]

Yes, that is how we decided we would signal client code if the beacon changes
its URL.

+ public:
+
+  // OnFound(url) will be called when a new url has been found.

[Olivier, 2016/08/22 07:45:09]

NIT: when a new URL has

[hayesjordan, 2016/08/22 17:06:22]

Done.

+  virtual void OnFound(const std::string& url) = 0;
+
+  // OnLost(url) will be called when a url can no longer be seen.

[Olivier, 2016/08/22 07:45:09]

NIT: when a URL can no longer...

[Olivier, 2016/08/22 07:45:09]

(for my personnal knowledge: is this timeout based?)

[cco3, 2016/08/22 17:02:44]

Yes.  We don't have a particular timeout chosen for iOS.  On Android, it will be
hidden to us, and we will just pass on onLost events that we get from Nearby.

[hayesjordan, 2016/08/22 17:06:22]

Done.

+  virtual void OnLost(const std::string& url) = 0;
+
+  // OnDistanceChagned(url, distance_estimate) will be called when the distance
+  // estimate is changed for the url.

[Olivier, 2016/08/22 07:45:09]

nit: for the URL.

[hayesjordan, 2016/08/22 17:06:22]

Done.

+  virtual void OnDistanceChanged(const std::string& url,
+                                 double distance_estimate) = 0;
+};
+
+#endif // COMPONENTS_PHYSICAL_WEB_DATA_SOURCE_PHYSICAL_WEB_LISTENER_H_