Add support to the UI Service to run it inside the browser's process.

services/ui/ws/window_server.cc

Index: services/ui/ws/window_server.cc
diff --git a/services/ui/ws/window_server.cc b/services/ui/ws/window_server.cc
index cb26903c32b01ee7ced0966804366ab0197c08b2..78bceb7ccd880f842b63b2706ff0eab51af162f4 100644
--- a/services/ui/ws/window_server.cc
+++ b/services/ui/ws/window_server.cc
@@ -111,6 +111,10 @@ void WindowServer::SetGpuHost(std::unique_ptr<GpuHost> gpu_host) {
   gpu_host_ = std::move(gpu_host);
 }
 
+ThreadedImageCursorsFactory* WindowServer::GetThreadedImageCursorsFactory() {
+  return delegate()->GetThreadedImageCursorsFactory();
+}
+
 ServerWindow* WindowServer::CreateServerWindow(
     const WindowId& id,
     const std::map<std::string, std::vector<uint8_t>>& properties) {