Plumbing from WebPresentationClient to the Presentation Mojo service for

content/common/presentation/presentation_service.mojom

Index: content/common/presentation/presentation_service.mojom
diff --git a/content/common/presentation/presentation_service.mojom b/content/common/presentation/presentation_service.mojom
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index 0000000000000000000000000000000000000000..c6c3d76d50e3940ba455a661bc7790cc89d49ef2
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+++ b/content/common/presentation/presentation_service.mojom
@@ -0,0 +1,20 @@
+// 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.
+
+module presentation;
+
+interface PresentationService {
+    // Returns the last session state if it’s changed since the last time the

[mark a. foltz, 2015/01/28 19:37:02]

Returns the last screen availability state

[whywhat, 2015/01/28 20:26:03]

Done.

+    // method was called. The client has to call this method again when handling
+    // the callback to get the next updates about the last availability status.

[mark a. foltz, 2015/01/28 19:37:02]

Which callback?

[mark a. foltz, 2015/01/28 19:37:02]

s/updates/update/

s/last//

[whywhat, 2015/01/28 20:26:03]

Done.

[whywhat, 2015/01/28 20:26:04]

Done.

+    // May start discovery of the presentation screens. The implementation might
+    // stop discovery once there are no active calls to GetScreenAvailability.
+    // |presentation_url| might be specified to help the

[mark a. foltz, 2015/01/28 19:37:02]

s/might/can/

[whywhat, 2015/01/28 20:26:04]

Done.

+    // implementation to filter the incompatible screens.

[mark a. foltz, 2015/01/28 19:37:02]

s/the/out/

[whywhat, 2015/01/28 20:26:03]

Done.

+    GetScreenAvailability(string? presentation_url) => (bool available);
+
+    // Called when the frame no longer listens to the
+    // |availablechange| event.
+    OnScreenAvailabilityListenerRemoved();
+};