Added plumbing for the availablechange event from Blink to WebPresentationClient.

public/platform/WebPresentationController.h

Index: public/platform/WebPresentationController.h
diff --git a/public/platform/WebPresentationController.h b/public/platform/WebPresentationController.h
new file mode 100644
index 0000000000000000000000000000000000000000..7180b711177f73446b94d312dffdb9636ca928f3
--- /dev/null
+++ b/public/platform/WebPresentationController.h
@@ -0,0 +1,19 @@
+// Copyright (c) 2015 The Chromium Authors. All rights reserved.

[Peter Beverloo, 2015/01/07 14:29:09]

nit: no (c).

[whywhat, 2015/01/07 16:22:16]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WebPresentationController_h
+#define WebPresentationController_h
+
+namespace blink {
+
+class WebPresentationController {

[Peter Beverloo, 2015/01/07 14:29:09]

dito re: documentation.

[whywhat, 2015/01/07 16:22:16]

Done.

+public:
+    virtual ~WebPresentationController() { }
+
+    virtual void deviceAvailabilityChanged(bool) = 0;

[Peter Beverloo, 2015/01/07 14:29:09]

Please give the argument a name.

[whywhat, 2015/01/07 16:22:16]

Done.

+};
+
+} // namespace blink
+
+#endif // WebPresentationController_h