Fix focus ring colors for slider and system menu button

Bug: 960116
Change-Id: I47ded12435e0b1c842eaf3aa2e5b506ca21486e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2018445Reviewed-by: Tim Song <tengs@chromium.org>
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735556}

ash/system/tray/system_menu_button.cc

@@ -4,6 +4,7 @@
 
 #include "ash/system/tray/system_menu_button.h"
 
+#include "ash/public/cpp/shelf_config.h"
 #include "ash/style/ash_color_provider.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray/tray_popup_ink_drop_style.h"
@@ -36,6 +37,7 @@ SystemMenuButton::SystemMenuButton(views::ButtonListener* listener,
   TrayPopupUtils::ConfigureTrayPopupButton(this);
   TrayPopupUtils::InstallHighlightPathGenerator(
       this, TrayPopupInkDropStyle::HOST_CENTERED);
+  focus_ring()->SetColor(ShelfConfig::Get()->shelf_focus_border_color());
 }
 
 SystemMenuButton::SystemMenuButton(views::ButtonListener* listener,

ash/system/unified/unified_slider_view.cc

@@ -89,6 +89,7 @@ UnifiedSliderButton::UnifiedSliderButton(views::ButtonListener* listener,
   SetVectorIcon(icon);
   SetBorder(views::CreateEmptyBorder(kUnifiedCircularButtonFocusPadding));
   views::InstallCircleHighlightPathGenerator(this);
+  focus_ring()->SetColor(UnifiedSystemTrayView::GetFocusRingColor());
 }
 
 UnifiedSliderButton::~UnifiedSliderButton() = default;