Implement "presentation" feature for window.open()

ui/gfx/screen_mac.mm

Index: ui/gfx/screen_mac.mm
diff --git a/ui/gfx/screen_mac.mm b/ui/gfx/screen_mac.mm
index 51c0b665b7e34274b98cf4c2d3386898af8c98f3..8ebb0dc02983bf02bbad98b99770335d50b87ac5 100644
--- a/ui/gfx/screen_mac.mm
+++ b/ui/gfx/screen_mac.mm
@@ -46,8 +46,11 @@ NSScreen* GetMatchingScreen(const gfx::Rect& match_rect) {
 
 gfx::Display GetDisplayForScreen(NSScreen* screen) {
   NSRect frame = [screen frame];
-  // TODO(oshima): Implement ID and Observer.
-  gfx::Display display(0, gfx::Rect(NSRectToCGRect(frame)));
+  // TODO(oshima): Implement Observer.
+
+  int64 displayId = [[[screen deviceDescription]
+    objectForKey:@"NSScreenNumber"] intValue];
+  gfx::Display display(displayId, gfx::Rect(NSRectToCGRect(frame)));
 
   NSRect visible_frame = [screen visibleFrame];
   NSScreen* primary = [[NSScreen screens] objectAtIndex:0];