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/sprite.go

Index: third_party/go/src/golang.org/x/mobile/sprite/sprite.go
diff --git a/third_party/go/src/golang.org/x/mobile/sprite/sprite.go b/third_party/go/src/golang.org/x/mobile/sprite/sprite.go
deleted file mode 100644
index 745b914176d35a381a6debf151ffd0ed5eb15bf3..0000000000000000000000000000000000000000
--- a/third_party/go/src/golang.org/x/mobile/sprite/sprite.go
+++ /dev/null
@@ -1,121 +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 sprite provides a 2D scene graph for rendering and animation.
-//
-// A tree of nodes is drawn by a rendering Engine, provided by another
-// package. The OS-independent Go version based on the image package is:
-//
-//	golang.org/x/mobile/sprite/portable
-//
-// An Engine draws a screen starting at a root Node. The tree is walked
-// depth-first, with affine transformations applied at each level.
-//
-// Nodes are rendered relative to their parent.
-//
-// Typical main loop:
-//
-//	for each frame {
-//		quantize time.Now() to a clock.Time
-//		process UI events
-//		modify the scene's nodes and animations (Arranger values)
-//		e.Render(scene, t)
-//	}
-package sprite // import "golang.org/x/mobile/sprite"
-
-import (
-	"image"
-	"image/draw"
-
-	"golang.org/x/mobile/f32"
-	"golang.org/x/mobile/sprite/clock"
-)
-
-type Arranger interface {
-	Arrange(e Engine, n *Node, t clock.Time)
-}
-
-type Texture interface {
-	Bounds() (w, h int)
-	Download(r image.Rectangle, dst draw.Image)
-	Upload(r image.Rectangle, src image.Image)
-	Unload()
-}
-
-type SubTex struct {
-	T Texture
-	R image.Rectangle
-}
-
-type Engine interface {
-	Register(n *Node)
-	Unregister(n *Node)
-
-	LoadTexture(a image.Image) (Texture, error)
-
-	SetSubTex(n *Node, x SubTex)
-	SetTransform(n *Node, m f32.Affine) // sets transform relative to parent.
-
-	Render(scene *Node, t clock.Time)
-}
-
-// A Node is a renderable element and forms a tree of Nodes.
-type Node struct {
-	Parent, FirstChild, LastChild, PrevSibling, NextSibling *Node
-
-	Arranger Arranger
-
-	// EngineFields contains fields that should only be accessed by Engine
-	// implementations. It is exported because such implementations can be
-	// in other packages.
-	EngineFields struct {
-		// TODO: separate TexDirty and TransformDirty bits?
-		Dirty  bool
-		Index  int32
-		SubTex SubTex
-	}
-}
-
-// AppendChild adds a node c as a child of n.
-//
-// It will panic if c already has a parent or siblings.
-func (n *Node) AppendChild(c *Node) {
-	if c.Parent != nil || c.PrevSibling != nil || c.NextSibling != nil {
-		panic("sprite: AppendChild called for an attached child Node")
-	}
-	last := n.LastChild
-	if last != nil {
-		last.NextSibling = c
-	} else {
-		n.FirstChild = c
-	}
-	n.LastChild = c
-	c.Parent = n
-	c.PrevSibling = last
-}
-
-// RemoveChild removes a node c that is a child of n. Afterwards, c will have
-// no parent and no siblings.
-//
-// It will panic if c's parent is not n.
-func (n *Node) RemoveChild(c *Node) {
-	if c.Parent != n {
-		panic("sprite: RemoveChild called for a non-child Node")
-	}
-	if n.FirstChild == c {
-		n.FirstChild = c.NextSibling
-	}
-	if c.NextSibling != nil {
-		c.NextSibling.PrevSibling = c.PrevSibling
-	}
-	if n.LastChild == c {
-		n.LastChild = c.PrevSibling
-	}
-	if c.PrevSibling != nil {
-		c.PrevSibling.NextSibling = c.NextSibling
-	}
-	c.Parent = nil
-	c.PrevSibling = nil
-	c.NextSibling = nil
-}