Use native coordinates to warp the cursor to another display.

ash/host/ash_window_tree_host.h

Index: ash/host/ash_window_tree_host.h
diff --git a/ash/host/ash_window_tree_host.h b/ash/host/ash_window_tree_host.h
index 9962b892835dfa68d6b16d830b0162432d311a3f..d54813b24f8c806d498b24e790d4102b63d1e970 100644
--- a/ash/host/ash_window_tree_host.h
+++ b/ash/host/ash_window_tree_host.h
@@ -14,6 +14,7 @@ class WindowTreeHost;
 }
 
 namespace gfx {
+class Insets;
 class Rect;
 }
 
@@ -41,6 +42,8 @@ class ASH_EXPORT AshWindowTreeHost {
   virtual void SetRootWindowTransformer(
       scoped_ptr<RootWindowTransformer> transformer) = 0;
 
+  virtual gfx::Insets GetHostInsets() const = 0;
+
   virtual aura::WindowTreeHost* AsWindowTreeHost() = 0;
 };