[Android] Expand the path of app_root in LaunchScreen
[Android] Expand the path of app_root in LaunchScreen

If the provided path of manifest.json is not absolute, the launch screen image can not be found
and will cause build fail.
Change to use ManifestParser.input_path.

BUG=XWALK-1795

chuan9/crosswalk,marcuspridham/crosswalk,minggangw/crosswalk,crosswalk-project/crosswalk-efl,amaniak/crosswalk,heke123/crosswalk,mrunalk/crosswalk,jondwillis/crosswalk,Pluto-tv/crosswalk,ZhengXinCN/crosswalk,leonhsl/crosswalk,lincsoon/crosswalk,crosswalk-project/crosswalk-efl,myroot/crosswalk,qjia7/crosswalk,heke123/crosswalk,jondwillis/crosswalk,lincsoon/crosswalk,axinging/crosswalk,DonnaWuDongxia/crosswalk,huningxin/crosswalk,TheDirtyCalvinist/spacewalk,rakuco/crosswalk,pk-sam/crosswalk,darktears/crosswalk,dreamsxin/crosswalk,qjia7/crosswalk,qjia7/crosswalk,crosswalk-project/crosswalk-efl,zeropool/crosswalk,chuan9/crosswalk,siovene/crosswalk,marcuspridham/crosswalk,rakuco/crosswalk,RafuCater/crosswalk,xzhan96/crosswalk,heke123/crosswalk,tomatell/crosswalk,heke123/crosswalk,myroot/crosswalk,fujunwei/crosswalk,zliang7/crosswalk,zliang7/crosswalk,pk-sam/crosswalk,darktears/crosswalk,heke123/crosswalk,tomatell/crosswalk,TheDirtyCalvinist/spacewalk,hgl888/crosswalk-efl,stonegithubs/crosswalk,hgl888/crosswalk,heke123/crosswalk,stonegithubs/crosswalk,Bysmyyr/crosswalk,TheDirtyCalvinist/spacewalk,Bysmyyr/crosswalk,baleboy/crosswalk,tomatell/crosswalk,lincsoon/crosswalk,minggangw/crosswalk,pk-sam/crosswalk,Bysmyyr/crosswalk,lincsoon/crosswalk,huningxin/crosswalk,jondong/crosswalk,chinakids/crosswalk,chinakids/crosswalk,bestwpw/crosswalk,alex-zhang/crosswalk,siovene/crosswalk,hgl888/crosswalk,qjia7/crosswalk,PeterWangIntel/crosswalk,crosswalk-project/crosswalk,mrunalk/crosswalk,baleboy/crosswalk,alex-zhang/crosswalk,stonegithubs/crosswalk,dreamsxin/crosswalk,axinging/crosswalk,hgl888/crosswalk-efl,lincsoon/crosswalk,jpike88/crosswalk,rakuco/crosswalk,alex-zhang/crosswalk,PeterWangIntel/crosswalk,amaniak/crosswalk,DonnaWuDongxia/crosswalk,huningxin/crosswalk,siovene/crosswalk,stonegithubs/crosswalk,tomatell/crosswalk,pk-sam/crosswalk,fujunwei/crosswalk,baleboy/crosswalk,XiaosongWei/crosswalk,chinakids/crosswalk,Bysmyyr/crosswalk,RafuCater/crosswalk,minggangw/crosswalk,marcuspridham/crosswalk,stonegithubs/crosswalk,Pluto-tv/crosswalk,crosswalk-project/crosswalk,zliang7/crosswalk,bestwpw/crosswalk,Pluto-tv/crosswalk,rakuco/crosswalk,pk-sam/crosswalk,PeterWangIntel/crosswalk,weiyirong/crosswalk-1,bestwpw/crosswalk,dreamsxin/crosswalk,jondong/crosswalk,tedshroyer/crosswalk,bestwpw/crosswalk,amaniak/crosswalk,hgl888/crosswalk-efl,mrunalk/crosswalk,ZhengXinCN/crosswalk,baleboy/crosswalk,zeropool/crosswalk,zeropool/crosswalk,baleboy/crosswalk,RafuCater/crosswalk,crosswalk-project/crosswalk,pk-sam/crosswalk,TheDirtyCalvinist/spacewalk,bestwpw/crosswalk,XiaosongWei/crosswalk,jondwillis/crosswalk,weiyirong/crosswalk-1,zliang7/crosswalk,minggangw/crosswalk,xzhan96/crosswalk,hgl888/crosswalk,PeterWangIntel/crosswalk,ZhengXinCN/crosswalk,DonnaWuDongxia/crosswalk,leonhsl/crosswalk,darktears/crosswalk,XiaosongWei/crosswalk,zliang7/crosswalk,XiaosongWei/crosswalk,hgl888/crosswalk-efl,jpike88/crosswalk,dreamsxin/crosswalk,crosswalk-project/crosswalk,chinakids/crosswalk,jondwillis/crosswalk,weiyirong/crosswalk-1,tedshroyer/crosswalk,RafuCater/crosswalk,dreamsxin/crosswalk,alex-zhang/crosswalk,fujunwei/crosswalk,heke123/crosswalk,hgl888/crosswalk,siovene/crosswalk,zliang7/crosswalk,DonnaWuDongxia/crosswalk,marcuspridham/crosswalk,qjia7/crosswalk,jpike88/crosswalk,ZhengXinCN/crosswalk,marcuspridham/crosswalk,mrunalk/crosswalk,huningxin/crosswalk,myroot/crosswalk,hgl888/crosswalk,Pluto-tv/crosswalk,jondong/crosswalk,Bysmyyr/crosswalk,hgl888/crosswalk,amaniak/crosswalk,crosswalk-project/crosswalk,leonhsl/crosswalk,hgl888/crosswalk,darktears/crosswalk,zliang7/crosswalk,leonhsl/crosswalk,Pluto-tv/crosswalk,Bysmyyr/crosswalk,fujunwei/crosswalk,DonnaWuDongxia/crosswalk,bestwpw/crosswalk,PeterWangIntel/crosswalk,TheDirtyCalvinist/spacewalk,hgl888/crosswalk-efl,jpike88/crosswalk,fujunwei/crosswalk,jondong/crosswalk,huningxin/crosswalk,PeterWangIntel/crosswalk,tomatell/crosswalk,crosswalk-project/crosswalk-efl,fujunwei/crosswalk,baleboy/crosswalk,weiyirong/crosswalk-1,Bysmyyr/crosswalk,DonnaWuDongxia/crosswalk,darktears/crosswalk,crosswalk-project/crosswalk,baleboy/crosswalk,ZhengXinCN/crosswalk,jondong/crosswalk,RafuCater/crosswalk,weiyirong/crosswalk-1,Pluto-tv/crosswalk,siovene/crosswalk,alex-zhang/crosswalk,hgl888/crosswalk-efl,crosswalk-project/crosswalk-efl,xzhan96/crosswalk,jondwillis/crosswalk,alex-zhang/crosswalk,minggangw/crosswalk,amaniak/crosswalk,PeterWangIntel/crosswalk,rakuco/crosswalk,Bysmyyr/crosswalk,lincsoon/crosswalk,Pluto-tv/crosswalk,alex-zhang/crosswalk,DonnaWuDongxia/crosswalk,tomatell/crosswalk,mrunalk/crosswalk,qjia7/crosswalk,darktears/crosswalk,ZhengXinCN/crosswalk,jpike88/crosswalk,myroot/crosswalk,weiyirong/crosswalk-1,minggangw/crosswalk,hgl888/crosswalk,chinakids/crosswalk,stonegithubs/crosswalk,axinging/crosswalk,zliang7/crosswalk,xzhan96/crosswalk,chuan9/crosswalk,myroot/crosswalk,tedshroyer/crosswalk,RafuCater/crosswalk,crosswalk-project/crosswalk,myroot/crosswalk,chuan9/crosswalk,dreamsxin/crosswalk,chinakids/crosswalk,RafuCater/crosswalk,baleboy/crosswalk,crosswalk-project/crosswalk-efl,siovene/crosswalk,jondwillis/crosswalk,zeropool/crosswalk,amaniak/crosswalk,jondong/crosswalk,chuan9/crosswalk,leonhsl/crosswalk,rakuco/crosswalk,zeropool/crosswalk,pk-sam/crosswalk,marcuspridham/crosswalk,weiyirong/crosswalk-1,darktears/crosswalk,ZhengXinCN/crosswalk,lincsoon/crosswalk,zeropool/crosswalk,lincsoon/crosswalk,huningxin/crosswalk,stonegithubs/crosswalk,tedshroyer/crosswalk,zeropool/crosswalk,chuan9/crosswalk,chuan9/crosswalk,xzhan96/crosswalk,fujunwei/crosswalk,crosswalk-project/crosswalk,axinging/crosswalk,xzhan96/crosswalk,bestwpw/crosswalk,darktears/crosswalk,jondong/crosswalk,amaniak/crosswalk,leonhsl/crosswalk,rakuco/crosswalk,mrunalk/crosswalk,marcuspridham/crosswalk,minggangw/crosswalk,XiaosongWei/crosswalk,axinging/crosswalk,XiaosongWei/crosswalk,tomatell/crosswalk,xzhan96/crosswalk,jpike88/crosswalk,minggangw/crosswalk,jondong/crosswalk,leonhsl/crosswalk,crosswalk-project/crosswalk-efl,marcuspridham/crosswalk,TheDirtyCalvinist/spacewalk,tedshroyer/crosswalk,hgl888/crosswalk-efl,jpike88/crosswalk,siovene/crosswalk,axinging/crosswalk,rakuco/crosswalk,jondwillis/crosswalk,axinging/crosswalk,tedshroyer/crosswalk,heke123/crosswalk,XiaosongWei/crosswalk,tedshroyer/crosswalk,xzhan96/crosswalk,dreamsxin/crosswalk