views: use darker stroke for non-prominent buttons

ui/views/controls/button/md_text_button.cc

Index: ui/views/controls/button/md_text_button.cc
diff --git a/ui/views/controls/button/md_text_button.cc b/ui/views/controls/button/md_text_button.cc
index 9b3d05986a6469e9d7ec436c6575f13065149d8d..3101cdf87e0a2f4fafa82af57de25c73becb3c8a 100644
--- a/ui/views/controls/button/md_text_button.cc
+++ b/ui/views/controls/button/md_text_button.cc
@@ -250,7 +250,6 @@ void MdTextButton::UpdateColors() {
   if (is_prominent_)
     SetTextColor(STATE_DISABLED, theme->GetSystemColor(fg_color_id));
 
-  SkColor text_color = label()->enabled_color();
   SkColor bg_color =
       theme->GetSystemColor(ui::NativeTheme::kColorId_DialogBackground);
 
@@ -270,8 +269,9 @@ void MdTextButton::UpdateColors() {
     bg_color = color_utils::GetResultingPaintColor(shade, bg_color);
   }
 
-  SkColor stroke_color =
-      is_prominent_ ? SK_ColorTRANSPARENT : SkColorSetA(text_color, 0x33);
+  SkColor stroke_color = theme->GetSystemColor(
+      is_prominent_ ? ui::NativeTheme::kColorId_ProminentButtonBorderColor
+                    : ui::NativeTheme::kColorId_NonProminentButtonBorderColor);

[Evan Stade, 2016/10/10 17:13:49]

this doesn't work well for buttons that use custom colors (like the Show All
button on the DL shelf).

I think we are supposed to be using kPrimaryTextColor for
kColorId_ButtonEnabledColor in common_theme.cc. That should fix both the text
color and the stroke.

   DCHECK_EQ(SK_AlphaOPAQUE, static_cast<int>(SkColorGetA(bg_color)));
   set_background(Background::CreateBackgroundPainter(
       true, Painter::CreateRoundRectWith1PxBorderPainter(