JavaActivity: Refactor for upcoming activity editing functionality
JavaActivity: Refactor for upcoming activity editing functionality

Introduce a generic editOnCreate() method that can insert or remove
configuration statements into the java activities' onCreate() method.
This can easily be re-used for the upcoming fullscreen and similar
modes.

pozdnyakov/crosswalk-app-tools,hgl888/crosswalk-app-tools,baleboy/crosswalk-app-tools,shawngao5/crosswalk-app-tools,davidmaxwaterman/crosswalk-app-tools,shawngao5/crosswalk-app-tools,pozdnyakov/crosswalk-app-tools,hgl888/crosswalk-app-tools,baleboy/crosswalk-app-tools,baleboy/crosswalk-app-tools,crosswalk-project/crosswalk-app-tools,crosswalk-project/crosswalk-app-tools,davidmaxwaterman/crosswalk-app-tools,crosswalk-project/crosswalk-app-tools