Add PP_VideoFrame, PPB_VideoReader, and PPB_VideoWriter APIs to Pepper.

ppapi/c/pp_video_frame.h

Index: ppapi/c/pp_video_frame.h
diff --git a/ppapi/c/pp_video_frame.h b/ppapi/c/pp_video_frame.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.
+ */
+
+/* From pp_video_frame.idl modified Tue Apr  2 10:07:49 2013. */
+
+#ifndef PPAPI_C_PP_VIDEO_FRAME_H_
+#define PPAPI_C_PP_VIDEO_FRAME_H_
+
+#include "ppapi/c/pp_macros.h"
+#include "ppapi/c/pp_resource.h"
+#include "ppapi/c/pp_stdint.h"
+#include "ppapi/c/pp_time.h"
+
+/**
+ * @file
+ * This file defines the struct used to hold a video frame.
+ */
+
+
+/**
+ * @addtogroup Structs
+ * @{
+ */
+/**
+ * The <code>PP_Video_Frame</code> struct represents a video frame.
+ */
+struct PP_VideoFrame {
+  /**
+   * A timestamp placing the frame in a video stream.
+   */
+  PP_TimeTicks timestamp;
+  /**
+   * An image data resource to hold the video frame.
+   */
+  PP_Resource image_data;
+  /**
+   * Ensure that this struct is 16-bytes wide by padding the end.  In some
+   * compilers, PP_TimeTicks is 8-byte aligned, so those compilers align this
+   * struct on 8-byte boundaries as well and pad it to 8 bytes even without this
+   * padding attribute.  This padding makes its size consistent across
+   * compilers.
+   */
+  int32_t padding;
+};
+PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_VideoFrame, 16);
+/**
+ * @}
+ */
+
+#endif  /* PPAPI_C_PP_VIDEO_FRAME_H_ */
+