gpu: Add flag for enabling asynchronous worker context.

content/renderer/pepper/ppb_graphics_3d_impl.cc

Index: content/renderer/pepper/ppb_graphics_3d_impl.cc
diff --git a/content/renderer/pepper/ppb_graphics_3d_impl.cc b/content/renderer/pepper/ppb_graphics_3d_impl.cc
index d3d26c9f97dff23891de4ed017d6a92b3e31c75e..ca150232e388fdf8d15de66f7fbdf319890d0dd0 100644
--- a/content/renderer/pepper/ppb_graphics_3d_impl.cc
+++ b/content/renderer/pepper/ppb_graphics_3d_impl.cc
@@ -267,9 +267,8 @@ bool PPB_Graphics3D_Impl::InitRaw(PPB_Graphics3D_API* share_context,
 
   command_buffer_ = channel->CreateCommandBuffer(
       gpu::kNullSurfaceHandle, surface_size, share_buffer,
-      gpu::GpuChannelHost::kDefaultStreamId,
-      gpu::GpuChannelHost::kDefaultStreamPriority, attribs, GURL::EmptyGURL(),
-      gpu_preference);
+      gpu::GPU_STREAM_DEFAULT, gpu::GpuStreamPriority::NORMAL, attribs,
+      GURL::EmptyGURL(), gpu_preference);
   if (!command_buffer_)
     return false;