Limit D3D V-sync experiment to Win 8.1+

content/browser/compositor/gpu_process_transport_factory.cc

 // Copyright 2014 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/compositor/gpu_process_transport_factory.h"
 
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 98 matching lines @@
 
 namespace {
 
 const int kNumRetriesBeforeSoftwareFallback = 4;
 // The client_id used here should not conflict with the client_id generated
 // from RenderWidgetHostImpl.
 constexpr uint32_t kDefaultClientId = 0u;
 
 bool IsGpuVSyncSignalSupported() {
 #if defined(OS_WIN)
-  // TODO(stanisc): http://crbug.com/467617 Limit to Windows 8+ for now because
-  // of locking issue caused by waiting for VSync on Win7.
-  return base::win::GetVersion() >= base::win::VERSION_WIN8 &&
+  // TODO(stanisc): http://crbug.com/467617 Limit to Windows 8.1+ for now
+  // because of locking issue caused by waiting for VSync on Win7 and Win 8.0.
+  return base::win::GetVersion() >= base::win::VERSION_WIN8_1 &&
          base::FeatureList::IsEnabled(features::kD3DVsync);
 #else
   return false;
 #endif  // defined(OS_WIN)
 }
 
 scoped_refptr<ui::ContextProviderCommandBuffer> CreateContextCommon(
     scoped_refptr<gpu::GpuChannelHost> gpu_channel_host,
     gpu::SurfaceHandle surface_handle,
     bool need_alpha_channel,
@@ skipping 812 matching lines @@
       shared_vulkan_context_provider_ =
           cc::VulkanInProcessContextProvider::Create();
     }
 
     shared_vulkan_context_provider_initialized_ = true;
   }
   return shared_vulkan_context_provider_;
 }
 
 }  // namespace content