exo: Synchronize multi-display window positioning

components/exo/shell_surface.h

 // Copyright 2015 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 COMPONENTS_EXO_SHELL_SURFACE_H_
 #define COMPONENTS_EXO_SHELL_SURFACE_H_
 
 #include <deque>
 #include <memory>
 #include <string>
@@ skipping 38 matching lines @@
  public:
   enum class BoundsMode { SHELL, CLIENT, FIXED };
 
   // The |origin| is in screen coordinates. When bounds are controlled by the
   // shell or fixed, it determines the initial position of the shell surface.
   // In that case, the position specified as part of the geometry is relative
   // to the shell surface.
   //
   // When bounds are controlled by the client, it represents the origin of a
   // coordinate system to which the position of the shell surface, specified
-  // as part of the geometry, is relative.
+  // as part of the geometry, is relative. The client must acknowledge changes
+  // to the origin, and offset the geometry accordingly.
   ShellSurface(Surface* surface,
                ShellSurface* parent,
                BoundsMode bounds_mode,
                const gfx::Point& origin,
                bool activatable,
                bool can_minimize,
                int container);
   explicit ShellSurface(Surface* surface);
   ~ShellSurface() override;
 
@@ skipping 19 matching lines @@
   }
 
   // Set the callback to run when the client is asked to configure the surface.
   // The size is a hint, in the sense that the client is free to ignore it if
   // it doesn't resize, pick a smaller size (to satisfy aspect ratio or resize
   // in steps of NxM pixels).
   using ConfigureCallback =
       base::Callback<uint32_t(const gfx::Size& size,
                               ash::wm::WindowStateType state_type,
                               bool resizing,
-                              bool activated)>;
+                              bool activated,
+                              const gfx::Point& origin)>;
   void set_configure_callback(const ConfigureCallback& configure_callback) {
     configure_callback_ = configure_callback;
   }
 
   // When the client is asked to configure the surface, it should acknowledge
   // the configure request sometime before the commit. |serial| is the serial
   // from the configure callback.
   void AcknowledgeConfigure(uint32_t serial);
 
   // Set the "parent" of this surface. This window should be stacked above a
@@ skipping 235 matching lines @@
   int top_inset_height_ = 0;
   int pending_top_inset_height_ = 0;
   bool shadow_underlay_in_surface_ = true;
 
   DISALLOW_COPY_AND_ASSIGN(ShellSurface);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_SHELL_SURFACE_H_