Use GPU blacklist to control accelerated video decode.

content/browser/gpu/gpu_data_manager_impl.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/browser/gpu/gpu_data_manager_impl.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ skipping 166 matching lines @@
   }
   if ((flags & content::GPU_FEATURE_TYPE_MULTISAMPLING) &&
       !command_line->HasSwitch(switches::kDisableGLMultisampling))
     command_line->AppendSwitch(switches::kDisableGLMultisampling);
   if ((flags & content::GPU_FEATURE_TYPE_ACCELERATED_COMPOSITING) &&
       !command_line->HasSwitch(switches::kDisableAcceleratedCompositing))
     command_line->AppendSwitch(switches::kDisableAcceleratedCompositing);
   if ((flags & content::GPU_FEATURE_TYPE_ACCELERATED_2D_CANVAS) &&
       !command_line->HasSwitch(switches::kDisableAccelerated2dCanvas))
     command_line->AppendSwitch(switches::kDisableAccelerated2dCanvas);
+  if ((flags & content::GPU_FEATURE_TYPE_ACCELERATED_VIDEO_DECODE) &&
+      !command_line->HasSwitch(switches::kDisableAcceleratedVideoDecode))
+    command_line->AppendSwitch(switches::kDisableAcceleratedVideoDecode);

[Ami GONE FROM CHROMIUM, 2012/08/17 00:19:17]

What is this doing?

[Zhenyao Mo, 2012/08/17 00:25:09]

This passes the switch to renderer process to disable accelerated_video_decode
if the feature is blacklisted.

[Ami GONE FROM CHROMIUM, 2012/08/17 04:15:52]

FWIW I was confused by the fact that GpuFeatureType lists "non-features" - the
flags it specifies are the blacklisted ones.

 }
 
 void GpuDataManagerImpl::AppendGpuCommandLine(
     CommandLine* command_line) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(command_line);
 
   std::string use_gl =
       CommandLine::ForCurrentProcess()->GetSwitchValueASCII(switches::kUseGL);
   FilePath swiftshader_path =
@@ skipping 148 matching lines @@
 
 void GpuDataManagerImpl::BlacklistCard() {
   card_blacklisted_ = true;
 
   gpu_feature_type_ = content::GPU_FEATURE_TYPE_ALL;
 
   EnableSoftwareRenderingIfNecessary();
   NotifyGpuInfoUpdate();
 }