Add support for multiple V4L2 video devices of the same type.

media/gpu/v4l2_slice_video_decode_accelerator.h

 // Copyright 2015 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_GPU_V4L2_SLICE_VIDEO_DECODE_ACCELERATOR_H_
 #define MEDIA_GPU_V4L2_SLICE_VIDEO_DECODE_ACCELERATOR_H_
 
 #include <linux/videodev2.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 385 matching lines @@
   // Output queue state.
   bool output_streamon_;
   // Number of output buffers enqueued to the device.
   int output_buffer_queued_count_;
   // Output buffers ready to use.
   std::list<int> free_output_buffers_;
   // Mapping of int index to an output buffer record.
   std::vector<OutputRecord> output_buffer_map_;
 
   VideoCodecProfile video_profile_;
+  uint32_t input_format_fourcc_;
   uint32_t output_format_fourcc_;
   gfx::Size visible_size_;
   gfx::Size coded_size_;
 
   struct BitstreamBufferRef;
   // Input queue of stream buffers coming from the client.
   std::queue<linked_ptr<BitstreamBufferRef>> decoder_input_queue_;
   // BitstreamBuffer currently being processed.
   std::unique_ptr<BitstreamBufferRef> decoder_current_bitstream_buffer_;
 
@@ skipping 54 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(V4L2SliceVideoDecodeAccelerator);
 };
 
 class V4L2H264Picture;
 class V4L2VP8Picture;
 class V4L2VP9Picture;
 
 }  // namespace media
 
 #endif  // MEDIA_GPU_V4L2_SLICE_VIDEO_DECODE_ACCELERATOR_H_