Plumbing stylus tilt for Mac

content/browser/renderer_host/input/web_input_event_builders_mac.mm

Index: content/browser/renderer_host/input/web_input_event_builders_mac.mm
diff --git a/content/browser/renderer_host/input/web_input_event_builders_mac.mm b/content/browser/renderer_host/input/web_input_event_builders_mac.mm
index 8ca506cfa82525c45975cdfb1eacff623b6da87e..d9cf15370d0d376278a578286087fb56a0d673a0 100644
--- a/content/browser/renderer_host/input/web_input_event_builders_mac.mm
+++ b/content/browser/renderer_host/input/web_input_event_builders_mac.mm
@@ -413,6 +413,9 @@ blink::WebMouseEvent WebMouseEventBuilder::Build(NSEvent* event, NSView* view) {
   }
   result.id = [event deviceID];
   result.force = [event pressure];
+  NSPoint tilt = [event tilt];
+  result.tiltX = lround(tilt.x * 90);
+  result.tiltY = lround(tilt.y * 90);
   return result;
 }