Media Capabilities: add plumbing between Blink and media/blink/.

third_party/WebKit/public/platform/modules/media_capabilities/WebMediaConfiguration.h

+// Copyright 2017 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 WebMediaConfiguration_h
+#define WebMediaConfiguration_h
+
+#include "base/optional.h"
+#include "public/platform/modules/media_capabilities/WebAudioConfiguration.h"
+#include "public/platform/modules/media_capabilities/WebVideoConfiguration.h"
+
+namespace blink {
+
+enum class MediaConfigurationType {
+  File,
+  MediaSource,
+};
+
+// Represents a MediaConfiguration dictionary to be used outside of Blink.
+// It is created by Blink and passed to consumers that can assume that all
+// required fields are properly set.
+struct WebMediaConfiguration {
+  MediaConfigurationType type;
+
+  base::Optional<WebAudioConfiguration> audioConfiguration;

[chcunningham, 2017/03/08 02:43:10]

Do you mean for these to be optional?

[mlamouri (slow - plz ping), 2017/03/10 11:26:42]

Yes. Per spec, one of them must be present but video only is fine such as audio
only.

Added comment about this.

+  base::Optional<WebVideoConfiguration> videoConfiguration;
+};
+
+}  // namespace blink
+
+#endif  // WebMediaConfiguration_h