Splitting the Mus demo code out of a service.

services/ui/demo/bitmap_uploader.cc

Index: services/ui/demo/bitmap_uploader.cc
diff --git a/services/ui/demo/bitmap_uploader.cc b/services/ui/demo/bitmap_uploader.cc
index c6653e1090a5860c5fe8b7c4c6668926f63d758e..51664be84f409e8d327d854d0e755da7a0263f6f 100644
--- a/services/ui/demo/bitmap_uploader.cc
+++ b/services/ui/demo/bitmap_uploader.cc
@@ -35,17 +35,16 @@ BitmapUploader::BitmapUploader(Window* window)
       width_(0),
       height_(0),
       format_(BGRA),
-      next_resource_id_(1u) {
-}
+      next_resource_id_(1u),
+      weak_factory_(this) {}
 
 void BitmapUploader::Init(ui::GpuService* gpu_service) {
   surface_ = window_->RequestSurface(mojom::SurfaceType::DEFAULT);
   surface_->BindToThread();
   surface_->set_client(this);
 
-  gles2_context_ = GLES2Context::CreateOffscreenContext(
-      gpu_service->EstablishGpuChannelSync(),
-      base::ThreadTaskRunnerHandle::Get());
+  gpu_service->EstablishGpuChannel(base::Bind(
+      &BitmapUploader::OnGpuChannelEstablished, weak_factory_.GetWeakPtr()));
 }
 
 BitmapUploader::~BitmapUploader() {}
@@ -174,6 +173,12 @@ void BitmapUploader::Upload() {
   surface_->SubmitCompositorFrame(std::move(frame), base::Closure());
 }
 
+void BitmapUploader::OnGpuChannelEstablished(
+    scoped_refptr<gpu::GpuChannelHost> gpu_channel) {
+  gles2_context_ = GLES2Context::CreateOffscreenContext(
+      gpu_channel, base::ThreadTaskRunnerHandle::Get());
+}
+
 uint32_t BitmapUploader::BindTextureForSize(const gfx::Size& size) {
   gpu::gles2::GLES2Interface* gl = gles2_context_->interface();
   // TODO(jamesr): Recycle textures.