[Controls Refresh] Adds correct dark mode focus ring styling on Mac

This CL add correct styling for the dark mode focus ring on mac

Bug: 1096269
Change-Id: Ib0fe9c18470a2333f48eeee921c9a8c02ac92162
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2256153Reviewed-by: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Yu Han <yuzhehan@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Sam Sebree <sasebree@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#782104}

third_party/blink/renderer/platform/graphics/graphics_context.cc

@@ -441,8 +441,14 @@ void GraphicsContext::DrawFocusRing(const Vector<IntRect>& rects,
                                     float min_border_width,
                                     const Color& color,
                                     WebColorScheme color_scheme) {
+#if defined(OS_MACOSX)
+  const Color& inner_color = color_scheme == WebColorScheme::kDark
+                                 ? SkColorSetRGB(0x99, 0xC8, 0xFF)
+                                 : color;
+#else
   const Color& inner_color =
       color_scheme == WebColorScheme::kDark ? SK_ColorWHITE : color;
+#endif
   if (::features::IsFormControlsRefreshEnabled()) {
     // The focus ring is made of two borders which have a 2:1 ratio.
     const float first_border_width = (width / 3) * 2;