Get rid of virtual Display::CreateScheduler.

content/browser/compositor/gpu_output_surface_mac.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/compositor/gpu_output_surface_mac.h"
 
 #include "components/display_compositor/compositor_overlay_candidate_validator.h"
 #include "content/browser/gpu/gpu_surface_tracker.h"
 #include "content/common/gpu/client/context_provider_command_buffer.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "gpu/ipc/client/gpu_process_hosted_ca_layer_tree_params.h"
 #include "ui/accelerated_widget_mac/accelerated_widget_mac.h"
 #include "ui/base/cocoa/remote_layer_api.h"
 #include "ui/gfx/mac/io_surface.h"
 
 namespace content {
 
 GpuOutputSurfaceMac::GpuOutputSurfaceMac(
     scoped_refptr<ContextProviderCommandBuffer> context,
     gpu::SurfaceHandle surface_handle,
     scoped_refptr<ui::CompositorVSyncManager> vsync_manager,
-    base::SingleThreadTaskRunner* task_runner,
+    cc::SyntheticBeginFrameSource* begin_frame_source,
     std::unique_ptr<display_compositor::CompositorOverlayCandidateValidator>
         overlay_candidate_validator,
     gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager)
     : GpuSurfacelessBrowserCompositorOutputSurface(
           std::move(context),
           surface_handle,
           std::move(vsync_manager),
-          task_runner,
+          begin_frame_source,
           std::move(overlay_candidate_validator),
           GL_TEXTURE_RECTANGLE_ARB,
           GL_RGBA,
           gpu_memory_buffer_manager) {}
 
 GpuOutputSurfaceMac::~GpuOutputSurfaceMac() {}
 
 void GpuOutputSurfaceMac::SwapBuffers(cc::CompositorFrame* frame) {
   GpuSurfacelessBrowserCompositorOutputSurface::SwapBuffers(frame);
 
@@ skipping 43 matching lines @@
           SHOULD_NOT_SHOW_FRAMES_NO_SWAP_AFTER_SUSPENDED;
     }
   }
 }
 
 bool GpuOutputSurfaceMac::SurfaceIsSuspendForRecycle() const {
   return should_show_frames_state_ == SHOULD_NOT_SHOW_FRAMES_SUSPENDED;
 }
 
 }  // namespace content