Remove third_party/golang.org/x/mobile as it is no longer used with Go 1.5.

third_party/go/src/golang.org/x/mobile/app/debug/fps.go

-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package debug provides GL-based debugging tools for apps.
-package debug // import "golang.org/x/mobile/app/debug"
-
-import (
-        "fmt"
-        "image"
-        "image/draw"
-        "log"
-        "math"
-        "sync"
-        "time"
-
-        "code.google.com/p/freetype-go/freetype"
-        "golang.org/x/mobile/font"
-        "golang.org/x/mobile/geom"
-        "golang.org/x/mobile/gl/glutil"
-)
-
-var lastDraw = time.Now()
-
-var monofont = freetype.NewContext()
-
-var fps struct {
-        sync.Once
-        *glutil.Image
-}
-
-// TODO(crawshaw): It looks like we need a gl.RegisterInit feature.
-// TODO(crawshaw): The gldebug mode needs to complain loudly when GL functions
-//                 are called before init, because often they fail silently.
-func fpsInit() {
-        b := font.Monospace()
-        f, err := freetype.ParseFont(b)
-        if err != nil {
-                panic(err)
-        }
-        monofont.SetFont(f)
-        monofont.SetSrc(image.Black)
-        monofont.SetHinting(freetype.FullHinting)
-
-        toPx := func(x geom.Pt) int { return int(math.Ceil(float64(geom.Pt(x).Px()))) }
-        fps.Image = glutil.NewImage(toPx(50), toPx(12))
-        monofont.SetDst(fps.Image.RGBA)
-        monofont.SetClip(fps.Bounds())
-        monofont.SetDPI(72 * float64(geom.PixelsPerPt))
-        monofont.SetFontSize(12)
-}
-
-// DrawFPS draws the per second framerate in the bottom-left of the screen.
-func DrawFPS() {
-        fps.Do(fpsInit)
-
-        now := time.Now()
-        diff := now.Sub(lastDraw)
-        str := fmt.Sprintf("%.0f FPS", float32(time.Second)/float32(diff))
-        draw.Draw(fps.Image, fps.Image.Rect, image.White, image.Point{}, draw.Src)
-
-        ftpt12 := freetype.Pt(0, int(12*geom.PixelsPerPt))
-        if _, err := monofont.DrawString(str, ftpt12); err != nil {
-                log.Printf("DrawFPS: %v", err)
-                return
-        }
-
-        fps.Upload()
-        fps.Draw(
-                geom.Point{0, geom.Height - 12},
-                geom.Point{50, geom.Height - 12},
-                geom.Point{0, geom.Height},
-                fps.Bounds(),
-        )
-
-        lastDraw = now
-}