Fix black screen when switching primary display without bounds change

ui/ozone/platform/drm/gpu/scanout_buffer.h

 // 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.
 
 #ifndef UI_OZONE_PLATFORM_DRM_GPU_SCANOUT_BUFFER_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_SCANOUT_BUFFER_H_
 
 #include <stdint.h>
 
 #include "base/memory/ref_counted.h"
@@ skipping 14 matching lines @@
   // memory for the registered framebuffer. This can be used to check if frame
   // buffer is compatible with a given hardware plane.
   virtual uint32_t GetFramebufferPixelFormat() const = 0;
 
   // Handle for the buffer. This is received when allocating the buffer.
   virtual uint32_t GetHandle() const = 0;
 
   // Size of the buffer.
   virtual gfx::Size GetSize() const = 0;
 
+  // Device on which the buffer was created.
+  virtual const DrmDevice* GetDrmDevice() const = 0;
+
   virtual bool RequiresGlFinish() const = 0;
 
  protected:
   virtual ~ScanoutBuffer() {}
 
   friend class base::RefCountedThreadSafe<ScanoutBuffer>;
 };
 
 class ScanoutBufferGenerator {
  public:
   virtual ~ScanoutBufferGenerator() {}
 
   virtual scoped_refptr<ScanoutBuffer> Create(
       const scoped_refptr<DrmDevice>& drm,
       gfx::BufferFormat format,
       const gfx::Size& size) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_SCANOUT_BUFFER_H_