gpu: Add flag for enabling asynchronous worker context.

content/renderer/pepper/pepper_video_encoder_host.cc

Index: content/renderer/pepper/pepper_video_encoder_host.cc
diff --git a/content/renderer/pepper/pepper_video_encoder_host.cc b/content/renderer/pepper/pepper_video_encoder_host.cc
index c33407fa08eaf5f1f8ac8d7c1b9d8d72589b3bce..617b7d282434b37ace026501f82386d751bb0eea 100644
--- a/content/renderer/pepper/pepper_video_encoder_host.cc
+++ b/content/renderer/pepper/pepper_video_encoder_host.cc
@@ -527,9 +527,8 @@ bool PepperVideoEncoderHost::EnsureGpuChannel() {
 
   std::vector<int32_t> attribs(1, PP_GRAPHICS3DATTRIB_NONE);
   command_buffer_ = channel->CreateCommandBuffer(
-      gpu::kNullSurfaceHandle, gfx::Size(), nullptr,
-      gpu::GpuChannelHost::kDefaultStreamId,
-      gpu::GpuChannelHost::kDefaultStreamPriority, attribs, GURL::EmptyGURL(),
+      gpu::kNullSurfaceHandle, gfx::Size(), nullptr, gpu::GPU_STREAM_DEFAULT,
+      gpu::GpuStreamPriority::NORMAL, attribs, GURL::EmptyGURL(),
       gfx::PreferIntegratedGpu);
   if (!command_buffer_) {
     Close();