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

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

Index: third_party/WebKit/public/platform/modules/media_capabilities/WebMediaCapabilitiesClient.h
diff --git a/third_party/WebKit/public/platform/modules/media_capabilities/WebMediaCapabilitiesClient.h b/third_party/WebKit/public/platform/modules/media_capabilities/WebMediaCapabilitiesClient.h
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index 0000000000000000000000000000000000000000..e98dbd5e84455ac1bd76e12a143d8f0d23757184
--- /dev/null
+++ b/third_party/WebKit/public/platform/modules/media_capabilities/WebMediaCapabilitiesClient.h
@@ -0,0 +1,27 @@
+// 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 WebMediaCapabilitiesClient_h
+#define WebMediaCapabilitiesClient_h
+
+#include <memory>
+
+#include "public/platform/modules/media_capabilities/WebMediaDecodingAbility.h"
+
+namespace blink {
+
+struct WebMediaConfiguration;
+
+// Interface between Blink and the Media layer.
+class WebMediaCapabilitiesClient {
+ public:
+  virtual ~WebMediaCapabilitiesClient() = default;
+
+  virtual void query(const WebMediaConfiguration&,
+                     std::unique_ptr<WebMediaCapabilitiesQueryCallbacks>) = 0;
+};
+
+}  // namespace blink
+
+#endif  // WebMediaCapabilitiesClient_h