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

content/common/gpu/media/vaapi_video_decode_accelerator.cc

 // 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.
 
 #include "content/common/gpu/media/vaapi_video_decode_accelerator.h"
 
 #include <string.h>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 312 matching lines @@
   if (make_context_current_cb_.is_null() || bind_image_cb_.is_null()) {
     NOTREACHED() << "GL callbacks are required for this VDA";
     return false;
   }
 
   if (config.is_encrypted) {
     NOTREACHED() << "Encrypted streams are not supported for this VDA";
     return false;
   }
 
+  if (config.output_mode != Config::OutputMode::ALLOCATE) {
+    NOTREACHED() << "Only ALLOCATE OutputMode is supported by this VDA";
+    return false;
+  }
+
   client_ptr_factory_.reset(new base::WeakPtrFactory<Client>(client));
   client_ = client_ptr_factory_->GetWeakPtr();
 
   media::VideoCodecProfile profile = config.profile;
 
   base::AutoLock auto_lock(lock_);
   DCHECK_EQ(state_, kUninitialized);
   DVLOG(2) << "Initializing VAVDA, profile: " << profile;
 
 #if defined(USE_X11)
@@ skipping 1412 matching lines @@
   return vaapi_pic->dec_surface();
 }
 
 // static
 media::VideoDecodeAccelerator::SupportedProfiles
 VaapiVideoDecodeAccelerator::GetSupportedProfiles() {
   return VaapiWrapper::GetSupportedDecodeProfiles();
 }
 
 }  // namespace content