Fix the issue Browser freeze when dragging the page and rotate the phone at the same times

When drag event is cancelled, the tab removing isn't needed. Or if it is the last one, browser will be closed and windows manager may be ANR.

Change-Id: Ia786d98727cecbe303cf9d153a471fd4a165b797
Author: Weiwei Ji <weiweix.ji@intel.com>
Signed-off-by: Xiaokang Qin <xiaokang.qin@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 30621
Browser freezes when adding new incognito tab after removing it

When do layout, the position of new tab may be changed since other tab
closed, we need to get the position again at the time.

Change-Id: Ia5bcc15a0074678f401d6b3e93026e5ef5d2af7d
Author: weiweix.ji <weiweix.ji@intel.com>
Signed-off-by: Xiaokang Qin <xiaokang.qin@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 66643
enable user debug to access advanced settings by default, disable java console by default, allow hardware skia accelleration preference for 2D in browser

Change-Id: I13d88f1b31c59d54071944cb97b790a8f3988013