Migrate fuzzer to use shiny new metrics2 package

fuzzer/go/generator/afl_generation.go

Index: fuzzer/go/generator/afl_generation.go
diff --git a/fuzzer/go/generator/afl_generation.go b/fuzzer/go/generator/afl_generation.go
index 46f0ab52f0759e434d7f08926a1d2b6e5a35a699..d5a4da95e5ea216c267165a91f8c03ff6198e7ca 100644
--- a/fuzzer/go/generator/afl_generation.go
+++ b/fuzzer/go/generator/afl_generation.go
@@ -7,19 +7,19 @@ import (
 	"path/filepath"
 	"strings"
 
-	go_metrics "github.com/rcrowley/go-metrics"
 	"github.com/skia-dev/glog"
 	"go.skia.org/infra/fuzzer/go/common"
 	"go.skia.org/infra/fuzzer/go/config"
 	"go.skia.org/infra/go/exec"
 	"go.skia.org/infra/go/fileutil"
 	"go.skia.org/infra/go/gs"
+	"go.skia.org/infra/go/metrics2"
 	"google.golang.org/cloud/storage"
 )
 
 type Generator struct {
 	Category         string
-	fuzzProcessCount go_metrics.Counter
+	fuzzProcessCount *metrics2.Counter
 	fuzzProcesses    []exec.Process
 }
 
@@ -34,6 +34,10 @@ func New(category string) *Generator {
 // n is specified by config.Generator.NumFuzzProcesses. Output goes to
 // config.Generator.AflOutputPath/[category].
 func (g *Generator) Start() error {
+	if config.Generator.SkipGeneration {
+		glog.Info("Skipping generation because flag was set.")
+		return nil
+	}
 	executable, err := g.setup()
 	if err != nil {
 		return fmt.Errorf("Failed %s generator setup: %s", g.Category, err)
@@ -58,7 +62,7 @@ func (g *Generator) Start() error {
 		// TODO(kjlubick): Make this actually an intelligent number based on the number of cores.
 		fuzzCount = 10
 	}
-	g.fuzzProcessCount = go_metrics.NewRegisteredCounter("afl_fuzz_process_count", go_metrics.DefaultRegistry)
+	g.fuzzProcessCount = metrics2.NewCounter("afl_fuzz_process_count", map[string]string{"category": g.Category})

[borenet, 2016/02/10 15:32:32]

Dashes

[kjlubick, 2016/02/10 16:14:29]

Done

 	g.fuzzProcessCount.Inc(int64(fuzzCount))
 	for i := 1; i < fuzzCount; i++ {
 		fuzzerName := fmt.Sprintf("fuzzer%d", i)