Implement Pepper PPB_VideoDecoder interface.

ppapi/proxy/video_decoder_constants.h

+// Copyright (c) 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_PROXY_VIDEO_DECODER_CONSTANTS_H_
+#define PPAPI_PROXY_VIDEO_DECODER_CONSTANTS_H_
+
+namespace ppapi {
+namespace proxy {
+
+// These constants are shared by the video decoder resource and host.
+enum {
+  // Maximum number of concurrent decodes which can be pending.
+  kMaximumPendingDecodes = 8,
+
+  // Minimum size of shared-memory buffers (100 KB). Make them large since we
+  // try to reuse them.
+  kMinimumBitstreamBufferSize = 100 << 10,
+
+  // Maximum size of shared-memory buffers (4 MB). This should be enough even
+  // for 4K video at reasonable compression levels.
+  kMaximumBitstreamBufferSize = 4 << 20
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_VIDEO_DECODER_CONSTANTS_H_