exo: Initial support for multiple displays in ARC

components/exo/shell_surface.h

Index: components/exo/shell_surface.h
diff --git a/components/exo/shell_surface.h b/components/exo/shell_surface.h
index 20b6d5b2dd0fc2a0c22a7a5ac6d7ed4b2e216900..089872f2606b7855c2ad6822f52861249ce4ae2c 100644
--- a/components/exo/shell_surface.h
+++ b/components/exo/shell_surface.h
@@ -56,7 +56,8 @@ class ShellSurface : public SurfaceDelegate,
   //
   // 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,
@@ -73,6 +74,11 @@ class ShellSurface : public SurfaceDelegate,
     close_callback_ = close_callback;
   }
 
+  // Set the callback to run when the shell surface is destroyed.
+  void set_destroyed_callback(const base::Closure& destroyed_callback) {
+    destroyed_callback_ = destroyed_callback;
+  }
+
   // Set the callback to run when the surface is destroyed.
   void set_surface_destroyed_callback(
       const base::Closure& surface_destroyed_callback) {
@@ -96,7 +102,8 @@ class ShellSurface : public SurfaceDelegate,
       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;
   }
@@ -282,8 +289,12 @@ class ShellSurface : public SurfaceDelegate,
   // determined by |component|.
   void AttemptToStartDrag(int component);
 
+  // Attempt to start a client-driven drag operation.
+  void AttemptToStartClientDrag();
+
   // End current drag operation.
   void EndDrag(bool revert);
+  void EndDrag(aura::Window* window, bool revert);
 
   // Returns true if surface is currently being resized.
   bool IsResizing() const;
@@ -305,6 +316,9 @@ class ShellSurface : public SurfaceDelegate,
   // |pending_shadow_content_bounds_|.
   void UpdateShadow();
 
+  // In the coordinate system of the parent root window.
+  gfx::Point GetMouseLocation() const;
+
   views::Widget* widget_ = nullptr;
   Surface* surface_;
   aura::Window* parent_;
@@ -324,6 +338,7 @@ class ShellSurface : public SurfaceDelegate,
   double scale_ = 1.0;
   double pending_scale_ = 1.0;
   base::Closure close_callback_;
+  base::Closure destroyed_callback_;
   base::Closure surface_destroyed_callback_;
   StateChangedCallback state_changed_callback_;
   ConfigureCallback configure_callback_;