Add PP_VideoFrame, PPB_VideoReader, and PPB_VideoWriter APIs to Pepper.

ppapi/cpp/video_reader.h

Index: ppapi/cpp/video_reader.h
diff --git a/ppapi/cpp/video_reader.h b/ppapi/cpp/video_reader.h
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+// Copyright (c) 2013 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_CPP_VIDEO_READER_H_
+#define PPAPI_CPP_VIDEO_READER_H_
+
+#include <string>
+
+#include "ppapi/c/pp_time.h"
+#include "ppapi/cpp/completion_callback.h"
+#include "ppapi/cpp/pass_ref.h"
+#include "ppapi/cpp/resource.h"
+
+/// @file
+/// This file defines the API to create and use video stream readers.
+
+namespace pp {
+
+class InstanceHandle;
+class VideoFrame;
+
+// VideoReader -----------------------------------------------------------------
+
+/// The <code>VideoReader</code> class represents a video reader resource.
+class VideoReader : public Resource {
+ public:
+  /// Default constructor for creating a <code>VideoReader</code> object.
+  VideoReader();
+
+  /// Constructor for creating a <code>VideoReader</code> for an instance.
+  explicit VideoReader(const InstanceHandle& instance);
+
+  /// The copy constructor for <code>VideoReader</code>.
+  ///
+  /// @param[in] other A reference to a <code>VideoReader</code>.
+  VideoReader(const VideoReader& other);
+
+  /// A constructor used when you have received a PP_Resource as a return
+  /// value that has had its reference count incremented for you.
+  ///
+  /// @param[in] resource A PP_Resource corresponding to a video reader.
+  VideoReader(PassRef, PP_Resource resource);
+
+  /// Opens a stream for reading video and associates it with the given id.
+  ///
+  /// @param[in] stream_id A string uniquely identifying the stream to read
+  /// from.
+  /// @param[in] callback A <code>CompletionCallback</code> to be called upon
+  /// completion of Open.
+  ///
+  /// @return A return code from <code>pp_errors.h</code>.
+  int32_t Open(const std::string& stream_id,
+               const CompletionCallback& cc);
+
+  /// Gets the next frame of video from the reader's stream.
+  ///
+  /// @param[in] callback A <code>CompletionCallbackWithOutput</code> to be
+  /// called upon completion of GetNextFrame.
+  ///
+  /// @return A return code from <code>pp_errors.h</code>.
+  int32_t GetFrame(const CompletionCallbackWithOutput<VideoFrame>& cc);
+
+  /// Closes the reader's current stream.
+  void Close();
+};
+
+}  // namespace pp
+
+#endif  // PPAPI_CPP_VIDEO_READER_H_