Enable VAAPI accelerated decode on Linux

content/common/gpu/media/gpu_video_decode_accelerator_factory_impl.h

 // Copyright 2016 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 CONTENT_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_FACTORY_IMPL_H_
 #define CONTENT_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_FACTORY_IMPL_H_
 
 #include "base/callback.h"
 #include "base/threading/thread_checker.h"
 #include "content/common/content_export.h"
@@ skipping 77 matching lines @@
 #if defined(OS_WIN)
   std::unique_ptr<media::VideoDecodeAccelerator> CreateDXVAVDA(
       const gpu::GpuPreferences& gpu_preferences) const;
 #endif
 #if defined(OS_CHROMEOS) && defined(USE_V4L2_CODEC)
   std::unique_ptr<media::VideoDecodeAccelerator> CreateV4L2VDA(
       const gpu::GpuPreferences& gpu_preferences) const;
   std::unique_ptr<media::VideoDecodeAccelerator> CreateV4L2SVDA(
       const gpu::GpuPreferences& gpu_preferences) const;
 #endif
-#if defined(OS_CHROMEOS) && defined(ARCH_CPU_X86_FAMILY)
+#if (defined(OS_CHROMEOS) || defined(OS_LINUX)) && defined(ARCH_CPU_X86_FAMILY)
   std::unique_ptr<media::VideoDecodeAccelerator> CreateVaapiVDA(
       const gpu::GpuPreferences& gpu_preferences) const;
 #endif
 #if defined(OS_MACOSX)
   std::unique_ptr<media::VideoDecodeAccelerator> CreateVTVDA(
       const gpu::GpuPreferences& gpu_preferences) const;
 #endif
 #if defined(OS_ANDROID)
   std::unique_ptr<media::VideoDecodeAccelerator> CreateAndroidVDA(
       const gpu::GpuPreferences& gpu_preferences) const;
 #endif
 
   const GetGLContextCallback get_gl_context_cb_;
   const MakeGLContextCurrentCallback make_context_current_cb_;
   const BindGLImageCallback bind_image_cb_;
   const GetGLES2DecoderCallback get_gles2_decoder_cb_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(GpuVideoDecodeAcceleratorFactoryImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_GPU_VIDEO_DECODE_ACCELERATOR_FACTORY_IMPL_H_