Enable VAAPI accelerated decode on Linux

content/browser/renderer_host/media/video_capture_gpu_jpeg_decoder.cc

 // 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.
 
 #include "content/browser/renderer_host/media/video_capture_gpu_jpeg_decoder.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 29 matching lines @@
   // |gpu_channel_host_| should outlive |decoder_|, so |gpu_channel_host_|
   // must be released after |decoder_| has been destroyed.
   gpu_channel_host_ = nullptr;
 }
 
 void VideoCaptureGpuJpegDecoder::Initialize() {
   DCHECK(CalledOnValidThread());
 
   base::AutoLock lock(lock_);
   bool is_platform_supported = false;
-#if defined(OS_CHROMEOS)
-  // Non-ChromeOS platforms do not support HW JPEG decode now. Do not establish
+#if defined(OS_CHROMEOS) || defined(OS_LINUX)
+  // Non-Linux platforms do not support HW JPEG decode now. Do not establish
   // gpu channel to avoid introducing overhead.
   is_platform_supported = true;
 #endif
 
   if (!is_platform_supported ||
       base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableAcceleratedMjpegDecode)) {
     decoder_status_ = FAILED;
     RecordInitDecodeUMA_Locked();
     return;
@@ skipping 186 matching lines @@
   lock_.AssertAcquired();
   return !decode_done_closure_.is_null();
 }
 
 void VideoCaptureGpuJpegDecoder::RecordInitDecodeUMA_Locked() {
   UMA_HISTOGRAM_BOOLEAN("Media.VideoCaptureGpuJpegDecoder.InitDecodeSuccess",
                         decoder_status_ == INIT_PASSED);
 }
 
 }  // namespace content