Hook up BeginFrameSource to SurfaceFactoryClient via SurfaceManager

components/mus/ws/test_server_window_delegate.cc

Index: components/mus/ws/test_server_window_delegate.cc
diff --git a/components/mus/ws/test_server_window_delegate.cc b/components/mus/ws/test_server_window_delegate.cc
index 9a033b3980a45a693b1b0f5d1798989739ea3325..1660e7826970a297112cb383d5db17c379aba64b 100644
--- a/components/mus/ws/test_server_window_delegate.cc
+++ b/components/mus/ws/test_server_window_delegate.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "components/mus/surfaces/surfaces_state.h"
 #include "components/mus/ws/test_server_window_delegate.h"
 #include "components/mus/ws/server_window.h"
 
@@ -9,12 +10,13 @@ namespace mus {
 
 namespace ws {
 
-TestServerWindowDelegate::TestServerWindowDelegate() : root_window_(nullptr) {}
+TestServerWindowDelegate::TestServerWindowDelegate()
+    : root_window_(nullptr), surfaces_state_(new SurfacesState()) {}
 
 TestServerWindowDelegate::~TestServerWindowDelegate() {}
 
 mus::SurfacesState* TestServerWindowDelegate::GetSurfacesState() {
-  return nullptr;
+  return surfaces_state_.get();
 }
 
 void TestServerWindowDelegate::OnScheduleWindowPaint(ServerWindow* window) {}