Presentation API: implement .getAvalability() (Blink side).

public/platform/modules/presentation/WebPresentationAvailabilityObserver.h

Index: public/platform/modules/presentation/WebPresentationAvailabilityObserver.h
diff --git a/public/platform/modules/presentation/WebPresentationAvailabilityObserver.h b/public/platform/modules/presentation/WebPresentationAvailabilityObserver.h
new file mode 100644
index 0000000000000000000000000000000000000000..beabaf01f93335c858685d11e4edd49d3d474cda
--- /dev/null
+++ b/public/platform/modules/presentation/WebPresentationAvailabilityObserver.h
@@ -0,0 +1,17 @@
+// Copyright 2015 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 WebPresentationAvailabilityObserver_h
+#define WebPresentationAvailabilityObserver_h
+
+namespace blink {
+
+class WebPresentationAvailabilityObserver {

[whywhat, 2015/07/02 22:32:38]

nit: document the new interface and its method, please

[mlamouri (slow - plz ping), 2015/07/03 13:58:26]

Done.

+public:
+    virtual void availabilityChanged(bool) = 0;
+};
+
+} // namespace blink
+
+#endif // WebPresentationAvailabilityObserver_h