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/sprite/glsprite/glsprite.go

Index: third_party/go/src/golang.org/x/mobile/sprite/glsprite/glsprite.go
diff --git a/third_party/go/src/golang.org/x/mobile/sprite/glsprite/glsprite.go b/third_party/go/src/golang.org/x/mobile/sprite/glsprite/glsprite.go
deleted file mode 100644
index 2cf7f376cc01b87e3d467b9b6536ce0dbc7e3171..0000000000000000000000000000000000000000
--- a/third_party/go/src/golang.org/x/mobile/sprite/glsprite/glsprite.go
+++ /dev/null
@@ -1,140 +0,0 @@
-// 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 glsprite implements a sprite Engine using OpenGL ES 2.
-//
-// Each sprite.Texture is loaded as a GL texture object and drawn
-// to the screen via an affine transform done in a simple shader.
-package glsprite // import "golang.org/x/mobile/sprite/glsprite"
-
-import (
-	"image"
-	"image/draw"
-
-	"golang.org/x/mobile/f32"
-	"golang.org/x/mobile/geom"
-	"golang.org/x/mobile/gl/glutil"
-	"golang.org/x/mobile/sprite"
-	"golang.org/x/mobile/sprite/clock"
-)
-
-type node struct {
-	// TODO: move this into package sprite as Node.EngineFields.RelTransform??
-	relTransform f32.Affine
-}
-
-type texture struct {
-	glImage *glutil.Image
-	b       image.Rectangle
-}
-
-func (t *texture) Bounds() (w, h int) { return t.b.Dx(), t.b.Dy() }
-
-func (t *texture) Download(r image.Rectangle, dst draw.Image) {
-	panic("TODO")
-}
-
-func (t *texture) Upload(r image.Rectangle, src image.Image) {
-	draw.Draw(t.glImage.RGBA, r, src, src.Bounds().Min, draw.Src)
-	t.glImage.Upload()
-}
-
-func (t *texture) Unload() {
-	panic("TODO")
-}
-
-func Engine() sprite.Engine {
-	return &engine{
-		nodes: []*node{nil},
-	}
-}
-
-type engine struct {
-	glImages map[sprite.Texture]*glutil.Image
-	nodes    []*node
-
-	absTransforms []f32.Affine
-}
-
-func (e *engine) Register(n *sprite.Node) {
-	if n.EngineFields.Index != 0 {
-		panic("glsprite: sprite.Node already registered")
-	}
-	o := &node{}
-	o.relTransform.Identity()
-
-	e.nodes = append(e.nodes, o)
-	n.EngineFields.Index = int32(len(e.nodes) - 1)
-}
-
-func (e *engine) Unregister(n *sprite.Node) {
-	panic("todo")
-}
-
-func (e *engine) LoadTexture(src image.Image) (sprite.Texture, error) {
-	b := src.Bounds()
-	t := &texture{glutil.NewImage(b.Dx(), b.Dy()), b}
-	t.Upload(b, src)
-	// TODO: set "glImage.Pix = nil"?? We don't need the CPU-side image any more.
-	return t, nil
-}
-
-func (e *engine) SetSubTex(n *sprite.Node, x sprite.SubTex) {
-	n.EngineFields.Dirty = true // TODO: do we need to propagate dirtiness up/down the tree?
-	n.EngineFields.SubTex = x
-}
-
-func (e *engine) SetTransform(n *sprite.Node, m f32.Affine) {
-	n.EngineFields.Dirty = true // TODO: do we need to propagate dirtiness up/down the tree?
-	e.nodes[n.EngineFields.Index].relTransform = m
-}
-
-func (e *engine) Render(scene *sprite.Node, t clock.Time) {
-	e.absTransforms = append(e.absTransforms[:0], f32.Affine{
-		{1, 0, 0},
-		{0, 1, 0},
-	})
-	e.render(scene, t)
-}
-
-func (e *engine) render(n *sprite.Node, t clock.Time) {
-	if n.EngineFields.Index == 0 {
-		panic("glsprite: sprite.Node not registered")
-	}
-	if n.Arranger != nil {
-		n.Arranger.Arrange(e, n, t)
-	}
-
-	// Push absTransforms.
-	// TODO: cache absolute transforms and use EngineFields.Dirty?
-	rel := &e.nodes[n.EngineFields.Index].relTransform
-	m := f32.Affine{}
-	m.Mul(&e.absTransforms[len(e.absTransforms)-1], rel)
-	e.absTransforms = append(e.absTransforms, m)
-
-	if x := n.EngineFields.SubTex; x.T != nil {
-		x.T.(*texture).glImage.Draw(
-			geom.Point{
-				geom.Pt(m[0][2]),
-				geom.Pt(m[1][2]),
-			},
-			geom.Point{
-				geom.Pt(m[0][2] + m[0][0]),
-				geom.Pt(m[1][2] + m[1][0]),
-			},
-			geom.Point{
-				geom.Pt(m[0][2] + m[0][1]),
-				geom.Pt(m[1][2] + m[1][1]),
-			},
-			x.R,
-		)
-	}
-
-	for c := n.FirstChild; c != nil; c = c.NextSibling {
-		e.render(c, t)
-	}
-
-	// Pop absTransforms.
-	e.absTransforms = e.absTransforms[:len(e.absTransforms)-1]
-}