Backport WebKit patch to fix input button paddings

Source/platform/mac/ThemeMac.mm

Index: Source/platform/mac/ThemeMac.mm
diff --git a/Source/platform/mac/ThemeMac.mm b/Source/platform/mac/ThemeMac.mm
index 5f2596fc0c27b0bed0d036d6655393e950dca8ec..a35aaeab206ecc69bee2f9cfbb7a4a1aacc943cb 100644
--- a/Source/platform/mac/ThemeMac.mm
+++ b/Source/platform/mac/ThemeMac.mm
@@ -659,7 +659,7 @@ LengthBox ThemeMac::controlPadding(ControlPart part, const FontDescription& font
             // This also guarantees the HTML <button> will match our rendering by default, since we're using a consistent
             // padding.
             const int padding = 8 * zoomFactor;
-            return LengthBox(0, padding, 0, padding);
+            return LengthBox(2, padding, 3, padding);
         }
         default:
             return Theme::controlPadding(part, fontDescription, zoomedBox, zoomFactor);