Share a common alpha value used for displaying disabled state in Harmony

ui/views/controls/focusable_border.cc

Index: ui/views/controls/focusable_border.cc
diff --git a/ui/views/controls/focusable_border.cc b/ui/views/controls/focusable_border.cc
index ee4005756d273f7400db24db20eea8d7f7767188..2d500a90f9f133f6afca0c239ec1f901b8ec56d7 100644
--- a/ui/views/controls/focusable_border.cc
+++ b/ui/views/controls/focusable_border.cc
@@ -85,11 +85,16 @@ void FocusableBorder::SetInsets(int top, int left, int bottom, int right) {
 SkColor FocusableBorder::GetCurrentColor(const View& view) const {
   if (!use_default_color_)
     return override_color_;
+
   SkColor color = view.GetNativeTheme()->GetSystemColor(
       view.HasFocus() ? ui::NativeTheme::kColorId_FocusedBorderColor :
                         ui::NativeTheme::kColorId_UnfocusedBorderColor);
-  if (ui::MaterialDesignController::IsSecondaryUiMaterial() && !view.enabled())
-    color = color_utils::BlendTowardOppositeLuma(color, 0x61);
+  if (ui::MaterialDesignController::IsSecondaryUiMaterial() &&
+      !view.enabled()) {
+    return color_utils::BlendTowardOppositeLuma(color,
+                                                gfx::kDisabledControlAlpha);
+  }
+
   return color;
 }