[PPAPI][MediaStream] Support configure for video input.

ppapi/shared_impl/media_stream_video_track_shared.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 PPAPI_SHARED_IMPL_MEDIA_STREAM_VIDEO_TRACK_SHARED_H_
+#define PPAPI_SHARED_IMPL_MEDIA_STREAM_VIDEO_TRACK_SHARED_H_
+
+#include "ppapi/c/ppb_video_frame.h"
+#include "ppapi/shared_impl/ppapi_shared_export.h"
+
+namespace ppapi {
+
+class PPAPI_SHARED_EXPORT MediaStreamVideoTrackShared {
+ public:
+  struct Attributes {
+    Attributes()
+        : buffers(0),
+          width(0),
+          height(0),
+          format(PP_VIDEOFRAME_FORMAT_UNKNOWN) {}
+    int32_t buffers;
+    int32_t width;
+    int32_t height;
+    PP_VideoFrame_Format format;
+  };
+
+  static bool VerifyAttributes(const Attributes& attributes);
+};
+
+}  // namespace ppapi
+
+#endif  // PPAPI_SHARED_IMPL_MEDIA_STREAM_VIDEO_TRACK_SHARED_H_