faet: add ScreenCap for gadb

hrp/pkg/gadb/client_test.go

@@ -140,7 +140,7 @@ func TestScreenCap(t *testing.T) {
 		t.Error(err)
 	}
 	d := dl[0]
-	res, err := d.RunShellCommandV2WithBytes("screencap", "-p")
+	res, err := d.ScreenCap()
 	if err != nil {
 		t.Error(err)
 	}

hrp/pkg/gadb/device.go

@@ -571,3 +571,7 @@ func (d *Device) Uninstall(packageName string, keepData ...bool) (string, error)
 	args = append(args, packageName)
 	return d.RunShellCommandV2("pm", args...)
 }
+
+func (d *Device) ScreenCap() ([]byte, error) {
+	return d.RunShellCommandV2WithBytes("screencap", "-p")
+}

hrp/pkg/uixt/android_adb_driver.go

@@ -280,9 +280,7 @@ func (ad *adbDriver) SetRotation(rotation Rotation) (err error) {
 
 func (ad *adbDriver) Screenshot() (raw *bytes.Buffer, err error) {
 	// adb shell screencap -p
-	resp, err := ad.adbClient.RunShellCommandWithBytes(
-		"screencap", "-p",
-	)
+	resp, err := ad.adbClient.ScreenCap()
 	if err == nil {
 		return bytes.NewBuffer(resp), nil
 	}