Get rid of virtual Display::CreateScheduler.

components/mus/surfaces/direct_output_surface_ozone.cc

Index: components/mus/surfaces/direct_output_surface_ozone.cc
diff --git a/components/mus/surfaces/direct_output_surface_ozone.cc b/components/mus/surfaces/direct_output_surface_ozone.cc
index a8c601de079b5eebc049dd817e895fa064b575c9..48af7d772fd97f95a98e965cd5a153cc298746ed 100644
--- a/components/mus/surfaces/direct_output_surface_ozone.cc
+++ b/components/mus/surfaces/direct_output_surface_ozone.cc
@@ -11,7 +11,7 @@
 #include "cc/output/compositor_frame.h"
 #include "cc/output/context_provider.h"
 #include "cc/output/output_surface_client.h"
-#include "cc/scheduler/delay_based_time_source.h"
+#include "cc/scheduler/begin_frame_source.h"
 #include "components/display_compositor/buffer_queue.h"
 #include "components/mus/common/gpu_service.h"
 #include "components/mus/common/mojo_gpu_memory_buffer_manager.h"
@@ -27,14 +27,13 @@ namespace mus {
 DirectOutputSurfaceOzone::DirectOutputSurfaceOzone(
     scoped_refptr<SurfacesContextProvider> context_provider,
     gfx::AcceleratedWidget widget,
-    base::SingleThreadTaskRunner* task_runner,
+    cc::SyntheticBeginFrameSource* synthetic_begin_frame_source,
     uint32_t target,
     uint32_t internalformat)
     : cc::OutputSurface(context_provider, nullptr, nullptr),
       gl_helper_(context_provider->ContextGL(),
                  context_provider->ContextSupport()),
-      synthetic_begin_frame_source_(new cc::DelayBasedBeginFrameSource(
-          base::MakeUnique<cc::DelayBasedTimeSource>(task_runner))),
+      synthetic_begin_frame_source_(synthetic_begin_frame_source),
       weak_ptr_factory_(this) {
   if (!GpuService::UseChromeGpuCommandBuffer()) {
     ozone_gpu_memory_buffer_manager_.reset(new OzoneGpuMemoryBufferManager());
@@ -108,8 +107,6 @@ bool DirectOutputSurfaceOzone::BindToClient(cc::OutputSurfaceClient* client) {
   if (!cc::OutputSurface::BindToClient(client))
     return false;
 
-  client->SetBeginFrameSource(synthetic_begin_frame_source_.get());
-
   if (capabilities_.uses_default_gl_framebuffer) {
     capabilities_.flipped_output_surface =
         context_provider()->ContextCapabilities().flips_vertically;