views: Mac pressed button shade 0.05a -> 0.1a

ui/native_theme/native_theme_mac.mm

Index: ui/native_theme/native_theme_mac.mm
diff --git a/ui/native_theme/native_theme_mac.mm b/ui/native_theme/native_theme_mac.mm
index c14fceafc6f4d117ed74ffff64bb81041bebac5d..bf8340e915a5c33feb7a0a3f02f21bf6b7aed478 100644
--- a/ui/native_theme/native_theme_mac.mm
+++ b/ui/native_theme/native_theme_mac.mm
@@ -150,7 +150,7 @@ SkColor ColorToGrayscale(SkColor color) {
     // Mac has a different "pressed button" styling because it doesn't use
     // ripples.
     case kColorId_ButtonPressedShade:
-      return SkColorSetA(SK_ColorBLACK, 0x08);
+      return SkColorSetA(SK_ColorBLACK, 0x10);
 
     // There's a system setting General > Highlight color which sets the
     // background color for text selections. We honor that setting.