Introduce OS_TIZEN and set specific settings for Tizen platforms
Introduce OS_TIZEN and set specific settings for Tizen platforms

Introduce it to the build system.

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