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

media/gpu/video_encode_accelerator_unittest.cc

 // Copyright 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 <inttypes.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 1113 matching lines @@
     encoder.reset(new FakeVideoEncodeAccelerator(
         scoped_refptr<base::SingleThreadTaskRunner>(
             base::ThreadTaskRunnerHandle::Get())));
   }
   return encoder;
 }
 
 std::unique_ptr<VideoEncodeAccelerator> VEAClient::CreateV4L2VEA() {
   std::unique_ptr<VideoEncodeAccelerator> encoder;
 #if defined(OS_CHROMEOS) && defined(USE_V4L2_CODEC)
-  scoped_refptr<V4L2Device> device = V4L2Device::Create(V4L2Device::kEncoder);
+  scoped_refptr<V4L2Device> device = V4L2Device::Create();
   if (device)
     encoder.reset(new V4L2VideoEncodeAccelerator(device));
 #endif
   return encoder;
 }
 
 std::unique_ptr<VideoEncodeAccelerator> VEAClient::CreateVaapiVEA() {
   std::unique_ptr<VideoEncodeAccelerator> encoder;
 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_X86_FAMILY)
   encoder.reset(new VaapiVideoEncodeAccelerator());
@@ skipping 796 matching lines @@
 
   media::g_env =
       reinterpret_cast<media::VideoEncodeAcceleratorTestEnvironment*>(
           testing::AddGlobalTestEnvironment(
               new media::VideoEncodeAcceleratorTestEnvironment(
                   std::move(test_stream_data), log_path, run_at_fps,
                   needs_encode_latency, verify_all_output)));
 
   return RUN_ALL_TESTS();
 }