Add proper duration to WebmEncoder-created files.

media/webm/chromeos/webm_encoder.h

 // Copyright (c) 2012 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 MEDIA_WEBM_CHROMEOS_WEBM_ENCODER_H_
 #define MEDIA_WEBM_CHROMEOS_WEBM_ENCODER_H_
 
 #include <stack>
 #include <stdio.h>
 
@@ skipping 52 matching lines @@
   void EbmlSerialize(const void* buffer, int buffer_size, unsigned long len);
 
   template <typename T>
   void EbmlSerializeHelper(const T* buffer, unsigned long len);
 
   // Video dimensions and FPS.
   size_t width_;
   size_t height_;
   vpx_rational_t fps_;
 
+  // Number of frames in video.
+  size_t frame_count_;
+
   // VPX config in use.
   vpx_codec_enc_cfg_t config_;
 
   // VPX parameters.
   int bitrate_;
   unsigned long deadline_;
 
   // EbmlWriter context.
   EbmlGlobal ebml_writer_;
 
   // Stack with start offsets of currently open sub-elements.
   std::stack<long int> ebml_sub_elements_;
 
   FilePath output_path_;
   FILE* output_;
 
   // True if an error occured while encoding/writing to file.
   bool has_errors_;
 
   DISALLOW_COPY_AND_ASSIGN(WebmEncoder);
 };
 
 }  // namespace chromeos
 
 }  // namespace media
 
 #endif  // MEDIA_WEBM_CHROMEOS_WEBM_ENCODER_H_