go.mobile/app: Add an entrypoint for non Java libraries to use for initializing a go runtime.
go.mobile/app: Add an entrypoint for non Java libraries to use for initializing a go runtime.

LGTM=crawshaw
R=golang-codereviews, crawshaw
CC=golang-codereviews
https://golang.org/cl/156040044

tempbottle/mobile,DanielWorld/mobile,lonphy23t/mobile,steeve/mobile,cainiaocome/mobile,swisspol/mobile,ichu501/mobile,grategames/mobile,goldcaddy77/mobile,goldcaddy77/mobile,samanalysis/mobile,xing/gomobile,golang/mobile,cainiaocome/mobile,0x90sled/mobile,0x90sled/mobile,ichu501/mobile,freeman0211/mobile,zach-klippenstein/mobile,ichu501/mobile,samanalysis/mobile,cainiaocome/mobile,b54898533/mobile,MaxCy330/mobile,MaxCy330/mobile,swisspol/mobile,ppamorim/mobile,samanalysis/mobile,MaxCy330/mobile,freeman0211/mobile,grategames/mobile,swisspol/mobile,freeman0211/mobile,goldcaddy77/mobile,zach-klippenstein/mobile,tempbottle/mobile,steeve/mobile,DanielWorld/mobile,0x90sled/mobile,xing/gomobile,golang/mobile,qskycolor/mobile,qskycolor/mobile,DanielWorld/mobile,ppamorim/mobile,goldcaddy77/mobile,b54898533/mobile,DanielWorld/mobile,swisspol/mobile,xing/gomobile,ppamorim/mobile,samanalysis/mobile,b54898533/mobile,xing/gomobile,ppamorim/mobile,MaxCy330/mobile,ichu501/mobile,ichu501/mobile,MaxCy330/mobile,qskycolor/mobile,b54898533/mobile,goldcaddy77/mobile,tempbottle/mobile,0x90sled/mobile,qskycolor/mobile,grategames/mobile,ppamorim/mobile,lonphy23t/mobile,lonphy23t/mobile,lonphy23t/mobile,tempbottle/mobile,lonphy23t/mobile,xing/gomobile,freeman0211/mobile,steeve/mobile,zach-klippenstein/mobile,zach-klippenstein/mobile,tempbottle/mobile,golang/mobile,cainiaocome/mobile,golang/mobile,grategames/mobile,swisspol/mobile,b54898533/mobile,cainiaocome/mobile,0x90sled/mobile,steeve/mobile,samanalysis/mobile