[ash-md] Allows ToggleButton to have a border and adds focus rectangle

ash/common/system/tray/tray_constants.cc

Index: ash/common/system/tray/tray_constants.cc
diff --git a/ash/common/system/tray/tray_constants.cc b/ash/common/system/tray/tray_constants.cc
index b0f71b1aa8a6ac99263d12e8a81fd1873212af17..0138c85606dad7fbf0f041c96d47fd44eca302e9 100644
--- a/ash/common/system/tray/tray_constants.cc
+++ b/ash/common/system/tray/tray_constants.cc
@@ -55,6 +55,8 @@ const SkColor kTrayPopupHoverBackgroundColor = SkColorSetRGB(0xe4, 0xe4, 0xe4);
 const int kTrayPopupScrollSeparatorHeight = 15;
 const int kTrayRoundedBorderRadius = 2;
 
+const int kTrayToggleButtonWidth = 68;
+
 const SkColor kBackgroundColor = SkColorSetRGB(0xfe, 0xfe, 0xfe);
 const SkColor kHoverBackgroundColor = SkColorSetRGB(0xf3, 0xf3, 0xf3);
 const SkColor kPublicAccountBackgroundColor = SkColorSetRGB(0xf8, 0xe5, 0xb6);