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.
+
+// Maximum number of concurrent decodes which can be pending.
+static const uint32_t kMaximumPendingDecodes = 8;

[Ami GONE FROM CHROMIUM, 2014/05/28 20:50:56]

Instead of allocating static storage in each compilation unit that includes this
file you could do
enum {
  kMaximumPendingDecodes = 8,
  kMin... = 100 << 10,
  ...
};

That would also ensure that only compile-time constants are used.

[bbudge, 2014/05/29 00:03:34]

Good idea. Done.

+
+// Minimum size of shared-memory buffers we allocate (100 KB). Make them large
+// since we try to reuse them.
+const uint32_t kMinimumBitstreamBufferSize = 100 << 10;
+
+// Maximum size of shared-memory buffers we allocate (4 MB). This should be
+// enough for even 4K video at reasonable compression levels.
+static const uint32_t kMaximumBitstreamBufferSize = 4 << 20;
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_VIDEO_DECODER_CONSTANTS_H_