exo: Synchronize multi-display window positioning

components/exo/display.h

Index: components/exo/display.h
diff --git a/components/exo/display.h b/components/exo/display.h
index dd9098a0c5a8109dd4d6da3412265960348c8bd8..7e9ee4ed68182284b7f156081565f46e6036d9e6 100644
--- a/components/exo/display.h
+++ b/components/exo/display.h
@@ -74,8 +74,10 @@ class Display {
       const gfx::Point& position);
 
   // Creates a remote shell surface for an existing surface using |container|.
-  std::unique_ptr<ShellSurface> CreateRemoteShellSurface(Surface* surface,
-                                                         int container);
+  std::unique_ptr<ShellSurface> CreateRemoteShellSurface(
+      Surface* surface,
+      const gfx::Point& origin,
+      int container);
 
   // Creates a sub-surface for an existing surface. The sub-surface will be
   // a child of |parent|.