gpu: Add flag for enabling asynchronous worker context.

content/browser/compositor/gpu_process_transport_factory.cc

Index: content/browser/compositor/gpu_process_transport_factory.cc
diff --git a/content/browser/compositor/gpu_process_transport_factory.cc b/content/browser/compositor/gpu_process_transport_factory.cc
index db1591fe5a2a4dfaf00cff55183b94639a5e5e11..7e37168881c67565a2f3594957e2a9a60b6b6bfa 100644
--- a/content/browser/compositor/gpu_process_transport_factory.cc
+++ b/content/browser/compositor/gpu_process_transport_factory.cc
@@ -129,7 +129,8 @@ scoped_refptr<content::ContextProviderCommandBuffer> CreateContextCommon(
 
   GURL url("chrome://gpu/GpuProcessTransportFactory::CreateContextCommon");
   return make_scoped_refptr(new content::ContextProviderCommandBuffer(
-      std::move(gpu_channel_host), surface_handle, url,
+      std::move(gpu_channel_host), gpu::GPU_STREAM_DEFAULT,
+      gpu::GpuStreamPriority::NORMAL, surface_handle, url,
       gfx::PreferIntegratedGpu, automatic_flushes, gpu::SharedMemoryLimits(),
       attributes, shared_context_provider, type));
 }