app: fix broken build.

Change-Id: I9c41f81bc287679cce5372f3aaf0b14a406eebd2
Reviewed-on: https://go-review.googlesource.com/14864
Reviewed-by: Nigel Tao <nigeltao@golang.org>

app/darwin_armx.go

@@ -185,7 +185,7 @@ func drawgl(ctx uintptr) {
 		select {
 		case <-gl.WorkAvailable:
 			gl.DoWork()
-		case <-publish:
+		case <-theApp.publish:
 			theApp.publishResult <- PublishResult{}
 			return
 		}

app/x11.go

@@ -67,12 +67,12 @@ func main(f func(App)) {
 			return
 		case <-gl.WorkAvailable:
 			gl.DoWork()
-		case <-publish:
+		case <-theApp.publish:
 			C.swapBuffers()
 			tc = ticker.C
 		case <-tc:
 			tc = nil
-			publishResult <- PublishResult{}
+			theApp.publishResult <- PublishResult{}
 		}
 		C.processEvents()
 	}