audio: move to exp/audio

Change-Id: I8640b1a38a292972db6dd00506e38c89470b2c15
Reviewed-on: https://go-review.googlesource.com/11311
Reviewed-by: Nigel Tao <nigeltao@golang.org>

example/audio/main.go

@@ -39,7 +39,7 @@ import (
 
 	"golang.org/x/mobile/app"
 	"golang.org/x/mobile/app/debug"
-	"golang.org/x/mobile/audio"
+	"golang.org/x/mobile/exp/audio"
 	"golang.org/x/mobile/exp/sprite"
 	"golang.org/x/mobile/exp/sprite/clock"
 	"golang.org/x/mobile/exp/sprite/glsprite"

exp/audio/al/al.go

@@ -20,7 +20,7 @@
 // license file to the open source notices of your application.
 // OpenAL Soft's license file could be found at
 // http://repo.or.cz/w/openal-soft.git/blob/HEAD:/COPYING.
-package al // import "golang.org/x/mobile/audio/al"
+package al // import "golang.org/x/mobile/exp/audio/al"
 
 // Enable enables a capability.
 func Enable(capability int32) {

exp/audio/audio.go

@@ -18,7 +18,7 @@
 // application.
 // OpenAL Soft's license file could be found at
 // http://repo.or.cz/w/openal-soft.git/blob/HEAD:/COPYING.
-package audio // import "golang.org/x/mobile/audio"
+package audio // import "golang.org/x/mobile/exp/audio"
 
 import (
 	"bytes"
@@ -28,7 +28,7 @@ import (
 	"sync"
 	"time"
 
-	"golang.org/x/mobile/audio/al"
+	"golang.org/x/mobile/exp/audio/al"
 )
 
 // ReadSeekCloser is an io.ReadSeeker and io.Closer.