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 4d3144387604e1e27503c39bb270eaaea69317ad..b5253bb4f1a5d72483952f7e1b8f4b8cd0c00a74 100644
--- a/services/ui/demo/bitmap_uploader.cc
+++ b/services/ui/demo/bitmap_uploader.cc
@@ -36,14 +36,12 @@ 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) {
-  compositor_frame_sink_ = window_->RequestCompositorFrameSink(
-      mojom::SurfaceType::DEFAULT,
-      new ContextProvider(gpu_service->EstablishGpuChannelSync()));
-  compositor_frame_sink_->BindToClient(this);
+  gpu_service->EstablishGpuChannel(base::Bind(
+      &BitmapUploader::OnGpuChannelEstablished, weak_factory_.GetWeakPtr()));
 }
 
 BitmapUploader::~BitmapUploader() {
@@ -175,6 +173,14 @@ void BitmapUploader::Upload() {
   compositor_frame_sink_->SubmitCompositorFrame(std::move(frame));
 }
 
+void BitmapUploader::OnGpuChannelEstablished(
+    scoped_refptr<gpu::GpuChannelHost> gpu_channel) {
+  compositor_frame_sink_ = window_->RequestCompositorFrameSink(
+      mojom::SurfaceType::DEFAULT,
+      new ContextProvider(gpu_channel));
+  compositor_frame_sink_->BindToClient(this);
+}
+
 uint32_t BitmapUploader::BindTextureForSize(const gfx::Size& size) {
   gpu::gles2::GLES2Interface* gl =
       compositor_frame_sink_->context_provider()->ContextGL();