Implemented system tray UI for new account management.

ash/system/tray/tray_constants.h

Index: ash/system/tray/tray_constants.h
diff --git a/ash/system/tray/tray_constants.h b/ash/system/tray/tray_constants.h
index 5e4bc24a39d28041c6066b3e6faa3a6f44af6ee6..a3179ebf7d2937ea579315a8a62c64dd3b564dd9 100644
--- a/ash/system/tray/tray_constants.h
+++ b/ash/system/tray/tray_constants.h
@@ -42,6 +42,7 @@ extern const int kTrayPopupAutoCloseDelayForTextInSeconds;
 extern const int kTrayPopupPaddingHorizontal;
 extern const int kTrayPopupPaddingBetweenItems;
 extern const int kTrayPopupTextSpacingVertical;
+extern const int kTrayPopupUserCardVerticalPadding;
 
 extern const int kTrayPopupItemHeight;
 extern const int kTrayPopupDetailsIconWidth;
@@ -71,6 +72,9 @@ extern const int kNotificationIconWidth;
 extern const int kNotificationButtonWidth;
 extern const int kTrayNotificationContentsWidth;
 
+extern const int kTrayAvatarCornerRadius;
+extern const int kTrayAvatarSize;
+
 // Returns kTraySpacing or kAlternateTraySpacing as applicable
 // (Determined by ash::switches::UseAlternateShelfLayout).
 int GetTraySpacing();