gpu: Add flag for enabling asynchronous worker context.

content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc

Index: content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
diff --git a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc b/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
index 59829714ae2e8de1b950893ecb86aa4129158f1b..afdfc5fa8c08bb14e0660464e3ea680c65609dca 100644
--- a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
+++ b/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
@@ -44,12 +44,16 @@ WebGraphicsContext3DCommandBufferImpl::WebGraphicsContext3DCommandBufferImpl(
     const GURL& active_url,
     scoped_refptr<gpu::GpuChannelHost> host,
     gfx::GpuPreference gpu_preference,
-    bool automatic_flushes)
-    : automatic_flushes_(automatic_flushes),
-      host_(std::move(host)),
+    bool automatic_flushes,
+    int32_t stream_id,
+    gpu::GpuStreamPriority stream_priority)
+    : host_(std::move(host)),
       surface_handle_(surface_handle),
       active_url_(active_url),
       gpu_preference_(gpu_preference),
+      automatic_flushes_(automatic_flushes),
+      stream_id_(stream_id),
+      stream_priority_(stream_priority),
       weak_ptr_factory_(this) {
   DCHECK(host_);
 }
@@ -114,10 +118,8 @@ bool WebGraphicsContext3DCommandBufferImpl::InitializeCommandBuffer(
 
   // Create a proxy to a command buffer in the GPU process.
   command_buffer_ = host_->CreateCommandBuffer(
-      surface_handle_, gfx::Size(), shared_command_buffer,
-      gpu::GpuChannelHost::kDefaultStreamId,
-      gpu::GpuChannelHost::kDefaultStreamPriority, serialized_attributes,
-      active_url_, gpu_preference_);
+      surface_handle_, gfx::Size(), shared_command_buffer, stream_id_,
+      stream_priority_, serialized_attributes, active_url_, gpu_preference_);
 
   if (!command_buffer_) {
     DLOG(ERROR) << "GpuChannelHost failed to create command buffer.";