cmd/cover: add total (statements) coverage to HTML output

[savinov]

Please answer these questions before submitting your issue. Thanks!

1. What version of Go are you using (go version)?
   go version go1.7 linux/amd64
2. What operating system and processor architecture are you using (go env)?
   GOARCH="amd64"
   GOBIN=""
   GOEXE=""
   GOHOSTARCH="amd64"
   GOHOSTOS="linux"
   GOOS="linux"
   GOPATH="/home/user/gowork"
   GORACE=""
   GOROOT="/home/user/go"
   GOTOOLDIR="/home/user/go/pkg/tool/linux_amd64"
   CC="gcc"
   GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0"
   CXX="g++"
   CGO_ENABLED="1"
3. What did you do?
   https://blog.golang.org/cover

go tool cover -func=coverage.out

size.go:    Size          42.9%
total:      (statements)  42.9%

go tool cover -html=coverage.out

1. What did you expect to see?
   I'd want to see total (statement) in generated HTML as in console output (func flag).
2. What did you see instead?
   An HTML without total (statement) coverage

[JayNakrani]

After golang.org/cl/32762:

$ ../pkg/tool/linux_amd64/cover -func=coverage.out
size.go:3:  Size            3/7     42.9%
total:      (statements)    3/7     42.9%

And for -html:

[gopherbot]

CL https://golang.org/cl/32762 mentions this issue.

[robpike]

The CL has been abandoned. We decided not to proceed with this.