media: Add MediaOzonePlatform support

media/ozone/media_ozone_platform.h

+// Copyright 2014 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 MEDIA_OZONE_MEDIA_OZONE_PLATFORM_H_
+#define MEDIA_OZONE_MEDIA_OZONE_PLATFORM_H_
+
+#include "base/callback.h"
+#include "media/base/media_export.h"
+
+namespace media {
+
+class VideoDecodeAccelerator;
+
+// Class for Ozone platform media implementations. Note that the base class for
+// Ozone platform is at ui/ozone.
+//
+// Ozone platforms must override this class and implement the virtual
+// GetFooFactoryOzone() methods to provide implementations of the
+// various ozone interfaces.
+class MEDIA_EXPORT MediaOzonePlatform {
+ public:
+  MediaOzonePlatform();
+  virtual ~MediaOzonePlatform();
+
+  // Besides get the global instance, initializes the subsystems/resources
+  // necessary for media also.
+  static MediaOzonePlatform* GetInstance();
+
+  // Factory getters to override in subclasses. The returned objects will be
+  // injected into the appropriate layer at startup. Subclasses should not
+  // inject these objects themselves. Ownership is retained by
+  // MediaOzonePlatform.
+  virtual VideoDecodeAccelerator* CreateVideoDecodeAccelerator(
+      const base::Callback<bool(void)>& make_context_current);
+
+ private:
+  static void CreateInstance();
+
+  static MediaOzonePlatform* instance_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaOzonePlatform);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_OZONE_MEDIA_OZONE_PLATFORM_H_