[M120 Migration][HBBTV] Dispatch key events through associated event dispatcher only

[M120 Migration][HBBTV] Dispatch key events through associated event dispatcher only

HBBTV app launches single ecore/elm window but two ewk_views within the
same window. The app can send key events through ewk api to any of the
ewk_view and they need to be dispatched irrespective of their focus state.
Currently the unfocused ewk_view is not dispatching event because of way
event forwarding logic is written in ozone layer.

This patch makes necessary changes to check the associated dispatcher handle
instead of CanDispatchEvent, also keeps both aura windows in focus parallely.
This change is only for HBBTV.

Reference: https://review.tizen.org/gerrit/299770

Change-Id: Iecb83a0f22665edd03795bd4745d69c88453395c
Signed-off-by: nishitha <n.saravanan@samsung.com>