Enable MJPEG HW decode accelerator on Intel CrOS platforms

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 "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 33 matching lines @@
 bool VideoCaptureGpuJpegDecoder::IsDecoding_Locked() {
   lock_.AssertAcquired();
   return !decode_done_closure_.is_null();
 }
 
 void VideoCaptureGpuJpegDecoder::Initialize() {
   DCHECK(CalledOnValidThread());
 
   // Non-ChromeOS platforms do not support HW JPEG decode now. Do not establish
   // gpu channel to introduce overhead.
-#if !defined(OS_CHROMEOS)
+  // TODO(henryhsu): enable on ARM platform after V4L2 JDA is ready.
+#if !defined(OS_CHROMEOS) || !defined(ARCH_CPU_X86_FAMILY)
   init_status_ = INIT_FAILED;
   return;
 #else
-  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableAcceleratedMjpegDecode)) {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDisableAcceleratedMjpegDecode)) {
     init_status_ = INIT_FAILED;
     return;
   }
 
   const scoped_refptr<base::SingleThreadTaskRunner> current_task_runner(
       base::ThreadTaskRunnerHandle::Get());
   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
                           base::Bind(&EstablishGpuChannelOnUIThread,
                                      current_task_runner, AsWeakPtr()));
 #endif
@@ skipping 157 matching lines @@
     decode_done_closure_ = base::Bind(
         decode_done_cb_, base::Passed(&out_buffer), out_frame, timestamp);
   }
   decoder_->Decode(in_buffer, out_frame);
 #else
   NOTREACHED();
 #endif
 }
 
 }  // namespace content