WebView-based subtitle styling renders EDGE_TYPE_DROP_SHADOW with bottom clipped

### ExoPlayer Version

2.17.1

### Devices that reproduce the issue

Mi 11 Lite

### Devices that do not reproduce the issue

_No response_

### Reproducible in the demo app?

Yes

### Reproduction steps

//I added this codes in demo app PlayerActivity#onCreate to reproduce the issue
SubtitleView subView = playerView.getSubtitleView();
subView.setViewType(SubtitleView.VIEW_TYPE_WEB);
subView.setStyle(new CaptionStyleCompat(
/* foregroundColor= */ Color.WHITE,
/* backgroundColor= */ 0,
/* windowColor= */ 0,
CaptionStyleCompat.EDGE_TYPE_DROP_SHADOW,
/* edgeColor= */ Color.RED,
/* typeface= */ null
));
//the following code helps showing the issue clearly but is not necessary
subView.setFractionalTextSize(0.12f);
ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) subView.getLayoutParams();
lp.bottomMargin = 50;
subView.requestLayout();

### Expected result

subtitle shows correctly

### Actual result

subtitle shows with some letter's bottom shadow clipped, like y,g,p
.

### Media

{
"name": "test",
"samples": [
{
"name": "test subtitle shadow",
"uri": "https://test.5ideachinese.com/profile/video/2022/02/42846ed3e5f7dac6d1ab45638764c6ff_02_09.mp4",
"subtitle_uri": "https://test.5ideachinese.com/profile/2022/02/ee07baee3ad31d7d2d674b59d3d849c9.vtt",
"subtitle_mime_type": "text/vtt",
"subtitle_language": "en"
}
]
}

### Bug Report

- [ ] You will email the zip file produced by `adb bugreport` to dev.exoplayer@gmail.com after filing this issue.