go.tools/cmd/cover: use a gradient to colorize "count" profiles
go.tools/cmd/cover: use a gradient to colorize "count" profiles

R=r
CC=golang-dev
https://golang.org/cl/10858047

springning/tools,nicot/tools,sshetty10/tools,argandas/tools,cmars/tools,cw2018/tools,cmars/tools,argandas/tools,nicot/tools,runcom/tools,syreclabs/go-tools,4ad/tools,maddyonline/tools,syreclabs/go-tools,nicot/tools,runcom/tools,magiccao/tools,golang/tools,maddyonline/tools,4ad/tools,springning/tools,dmitris/tools,golang/tools,golang/tools,matryer/tools,jdhenke/tools,magiccao/tools,argandas/tools,glasser/golang-tools,cmars/tools,maddyonline/tools,sshetty10/tools,syreclabs/go-tools,springning/tools,jdhenke/tools,cw2018/tools,magiccao/tools,golang/tools,maddyonline/tools,jdhenke/tools,josharian/tools,jdhenke/tools,dmitris/tools,runcom/tools,sshetty10/tools,cw2018/tools,dmitris/tools,magiccao/tools,josharian/tools,runcom/tools,cmars/tools,syreclabs/go-tools,golang/tools,glasser/golang-tools,matryer/tools,matryer/tools,syreclabs/go-tools,dmitris/tools,4ad/tools,glasser/golang-tools,springning/tools,josharian/tools,cw2018/tools,josharian/tools,nicot/tools,glasser/golang-tools,syreclabs/go-tools,argandas/tools,sshetty10/tools,matryer/tools