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diff --git a/third_party/aom/test/webm_video_source.h b/third_party/aom/test/webm_video_source.h
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+++ b/third_party/aom/test/webm_video_source.h
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+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+#ifndef TEST_WEBM_VIDEO_SOURCE_H_
+#define TEST_WEBM_VIDEO_SOURCE_H_
+#include <cstdarg>
+#include <cstdio>
+#include <cstdlib>
+#include <new>
+#include <string>
+#include "../tools_common.h"
+#include "../webmdec.h"
+#include "test/video_source.h"
+
+namespace libaom_test {
+
+// This class extends VideoSource to allow parsing of WebM files,
+// so that we can do actual file decodes.
+class WebMVideoSource : public CompressedVideoSource {
+ public:
+  explicit WebMVideoSource(const std::string &file_name)
+      : file_name_(file_name), aom_ctx_(new AvxInputContext()),
+        webm_ctx_(new WebmInputContext()), buf_(NULL), buf_sz_(0), frame_(0),
+        end_of_file_(false) {}
+
+  virtual ~WebMVideoSource() {
+    if (aom_ctx_->file != NULL) fclose(aom_ctx_->file);
+    webm_free(webm_ctx_);
+    delete aom_ctx_;
+    delete webm_ctx_;
+  }
+
+  virtual void Init() {}
+
+  virtual void Begin() {
+    aom_ctx_->file = OpenTestDataFile(file_name_);
+    ASSERT_TRUE(aom_ctx_->file != NULL) << "Input file open failed. Filename: "
+                                        << file_name_;
+
+    ASSERT_EQ(file_is_webm(webm_ctx_, aom_ctx_), 1) << "file is not WebM";
+
+    FillFrame();
+  }
+
+  virtual void Next() {
+    ++frame_;
+    FillFrame();
+  }
+
+  void FillFrame() {
+    ASSERT_TRUE(aom_ctx_->file != NULL);
+    const int status = webm_read_frame(webm_ctx_, &buf_, &buf_sz_);
+    ASSERT_GE(status, 0) << "webm_read_frame failed";
+    if (status == 1) {
+      end_of_file_ = true;
+    }
+  }
+
+  void SeekToNextKeyFrame() {
+    ASSERT_TRUE(aom_ctx_->file != NULL);
+    do {
+      const int status = webm_read_frame(webm_ctx_, &buf_, &buf_sz_);
+      ASSERT_GE(status, 0) << "webm_read_frame failed";
+      ++frame_;
+      if (status == 1) {
+        end_of_file_ = true;
+      }
+    } while (!webm_ctx_->is_key_frame && !end_of_file_);
+  }
+
+  virtual const uint8_t *cxdata() const { return end_of_file_ ? NULL : buf_; }
+  virtual size_t frame_size() const { return buf_sz_; }
+  virtual unsigned int frame_number() const { return frame_; }
+
+ protected:
+  std::string file_name_;
+  AvxInputContext *aom_ctx_;
+  WebmInputContext *webm_ctx_;
+  uint8_t *buf_;
+  size_t buf_sz_;
+  unsigned int frame_;
+  bool end_of_file_;
+};
+
+}  // namespace libaom_test
+
+#endif  // TEST_WEBM_VIDEO_SOURCE_H_