Dark mode: set link color

Bug: 918194
Change-Id: I4ffe380241ebaf46adac236535e8138729bfd227
Reviewed-on: https://chromium-review.googlesource.com/c/1393523Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619516}

ui/native_theme/common_theme.cc

@@ -54,6 +54,9 @@ SkColor GetAuraColor(NativeTheme::ColorId color_id,
         return SkColorSetA(gfx::kGoogleGrey800, 0xCC);
       case NativeTheme::kColorId_TextfieldDefaultBackground:
         return SkColorSetA(SK_ColorBLACK, 0x4D);
+      case NativeTheme::kColorId_LinkEnabled:
+      case NativeTheme::kColorId_LinkPressed:
+        return gfx::kGoogleBlue300;
 
       default:
         break;