Support external buffer import in VDA interface and add a V4L2SVDA impl.

content/common/gpu/media/android_video_decode_accelerator.cc

 // 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.
 
 #include "content/common/gpu/media/android_video_decode_accelerator.h"
 
 #include <stddef.h>
 
 #include "base/android/build_info.h"
 #include "base/auto_reset.h"
@@ skipping 276 matching lines @@
   DCHECK(thread_checker_.CalledOnValidThread());
   TRACE_EVENT0("media", "AVDA::Initialize");
 
   DVLOG(1) << __FUNCTION__ << ": " << config.AsHumanReadableString();
 
   if (make_context_current_cb_.is_null() || get_gles2_decoder_cb_.is_null()) {
     NOTREACHED() << "GL callbacks are required for this VDA";
     return false;
   }
 
+  if (config.output_mode != Config::OutputMode::ALLOCATE) {
+    NOTREACHED() << "Only ALLOCATE OutputMode is supported by this VDA";
+    return false;
+  }
+
   DCHECK(client);
   client_ = client;
   codec_ = VideoCodecProfileToVideoCodec(config.profile);
   is_encrypted_ = config.is_encrypted;
 
   bool profile_supported = codec_ == media::kCodecVP8 ||
                            codec_ == media::kCodecVP9 ||
                            codec_ == media::kCodecH264;
 
   if (!profile_supported) {
@@ skipping 916 matching lines @@
     capabilities.flags = media::VideoDecodeAccelerator::Capabilities::
                              NEEDS_ALL_PICTURE_BUFFERS_TO_DECODE |
                          media::VideoDecodeAccelerator::Capabilities::
                              SUPPORTS_EXTERNAL_OUTPUT_SURFACE;
   }
 
   return capabilities;
 }
 
 }  // namespace content