D15910: Implement wl_surface::damage_buffer

[Roman Gilg]

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REVISION SUMMARY
  Missing from our surface handling was the damage_buffer call introduced in
  version 4 of the wl_compositor interface.
  
  Its only difference to a normal damage call is that the damaged region is
  supposed to be defined by the client in buffer coordinates instead of
  surface coordinates. This damage must be tracked separately in KWayland
  and on commit with the buffer transformation united with the normal damage.

TEST PLAN
  Autotest updated.

REPOSITORY
  R127 KWayland

BRANCH
  damageBuffer

REVISION DETAIL
  https://phabricator.kde.org/D15910

AFFECTED FILES
  autotests/client/test_wayland_surface.cpp
  src/client/registry.cpp
  src/client/surface.cpp
  src/client/surface.h
  src/server/compositor_interface.cpp
  src/server/surface_interface.cpp
  src/server/surface_interface_p.h

To: romangg, #kwin
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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