atspi: make plug and socket window work

atspi: make plug and socket window work

This is for making Elm.Plug and Efl.Ui.Win_Socket_Legacy work
Elm.Plug (Embedding side such as Quickpanel) has a child Elm.Atspi.Proxy
Efl.Ui.Win_Socket_Legacy (Such as Music player) also has Elm.Atspi.Proxy.

1 finger tap did not work because PLUG proxy does not have size.
It is able to override efl_access_component_accessible_at_get to fix this.
But this patch set makes PLUG proxy have size.

flick "next" and "prev" did not work.
The changes in elm_atspi_bridge.c is fixing this issue.
Each comment explains what the change is going to fix.

This patch is fixing following items
(1) connection between plug and socket window including
    atspi on > off > on case
(2) 1 finger single tap on socket window
(3) 1 finger swipe between plug and socket window
(4) 1 finger double tap and hold on socket window, then 1 finger tap on plug

*tizen-fix

Change-Id: I34f76892da29232c4ae9da892d550fc023759570