Fixing Display Mirror Mode issue

content/browser/compositor/gpu_process_transport_factory.cc

 // Copyright 2014 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_process_transport_factory.h"
 
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 552 matching lines @@
           DCHECK(begin_frame_source);
           display_output_surface = std::move(mus_output_surface);
 #else
           NOTREACHED();
 #endif
         }
       }
     }
   }
 
+  data->display_output_surface = display_output_surface.get();
+  if (data->reflector)
+    data->reflector->OnSourceSurfaceReady(data->display_output_surface);
+
   std::unique_ptr<cc::SyntheticBeginFrameSource> synthetic_begin_frame_source;
   std::unique_ptr<GpuVSyncBeginFrameSource> gpu_vsync_begin_frame_source;
 
   if (!begin_frame_source) {
     if (!compositor->GetRendererSettings().disable_display_vsync) {
       if (gpu_vsync_control && IsGpuVSyncSignalSupported()) {
         gpu_vsync_begin_frame_source =
             base::MakeUnique<GpuVSyncBeginFrameSource>(gpu_vsync_control);
         begin_frame_source = gpu_vsync_begin_frame_source.get();
       } else {
         synthetic_begin_frame_source =
             base::MakeUnique<cc::DelayBasedBeginFrameSource>(
                 base::MakeUnique<cc::DelayBasedTimeSource>(
                     compositor->task_runner().get()));
         begin_frame_source = synthetic_begin_frame_source.get();
       }
     } else {
       synthetic_begin_frame_source =
           base::MakeUnique<cc::BackToBackBeginFrameSource>(
               base::MakeUnique<cc::DelayBasedTimeSource>(
                   compositor->task_runner().get()));
       begin_frame_source = synthetic_begin_frame_source.get();
     }
   }
 
-  if (data->reflector)
-    data->reflector->OnSourceSurfaceReady(data->display_output_surface);
-
 #if defined(OS_WIN)
   gfx::RenderingWindowManager::GetInstance()->DoSetParentOnChild(
       compositor->widget());
 #endif
 
   std::unique_ptr<cc::DisplayScheduler> scheduler(new cc::DisplayScheduler(
       compositor->task_runner().get(),
       display_output_surface->capabilities().max_frames_pending));
 
   // The Display owns and uses the |display_output_surface| created above.
@@ skipping 339 matching lines @@
       shared_vulkan_context_provider_ =
           cc::VulkanInProcessContextProvider::Create();
     }
 
     shared_vulkan_context_provider_initialized_ = true;
   }
   return shared_vulkan_context_provider_;
 }
 
 }  // namespace content