app,app/internal/wm: implement ViewEvent for macOS

Move the deprecated setWantsBestResolutionOpenGLSurface to GL-specific
code while we're here.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/internal/wm/os_js.go

@@ -4,7 +4,6 @@ package wm
 
 import (
 	"fmt"
-	"gioui.org/internal/f32color"
 	"image"
 	"image/color"
 	"strings"
@@ -14,6 +13,8 @@ import (
 	"unicode"
 	"unicode/utf8"
 
+	"gioui.org/internal/f32color"
+
 	"gioui.org/f32"
 	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
@@ -22,6 +23,8 @@ import (
 	"gioui.org/unit"
 )
 
+type ViewEvent struct{}
+
 type window struct {
 	window                js.Value
 	document              js.Value
@@ -671,3 +674,5 @@ func translateKey(k string) (string, bool) {
 	}
 	return n, true
 }
+
+func (_ ViewEvent) ImplementsEvent() {}