Make spacing between uber tray items consistent with UI spec.

ash/system/tray/tray_constants.cc

Index: ash/system/tray/tray_constants.cc
diff --git a/ash/system/tray/tray_constants.cc b/ash/system/tray/tray_constants.cc
index c7927d2bee28cc07f72b3b7d1393c92cf2da9f21..d3303635f168f24e123e081261c6cbae4d1590c1 100644
--- a/ash/system/tray/tray_constants.cc
+++ b/ash/system/tray/tray_constants.cc
@@ -14,6 +14,13 @@ const int kPaddingFromOuterEdgeOfLauncherVerticalAlignment = 8;
 const int kPaddingFromInnerEdgeOfLauncherVerticalAlignment = 7;
 const int kPaddingFromBottomOfScreenVerticalAlignment = 10;
 
+const int kTrayImageItemHorizontalPaddingBottomAlignment = 1;
+const int kTrayImageItemHorizontalPaddingVerticalAlignment = 1;
+const int kTrayImageItemVerticalPaddingVerticalAlignment = 1;
+
+const int kTrayLabelItemHorizontalPaddingBottomAlignment = 7;
+const int kTrayLabelItemVerticalPaddingVeriticalAlignment = 4;
+
 const int kTrayPopupAutoCloseDelayInSeconds = 2;
 const int kTrayPopupAutoCloseDelayForTextInSeconds = 5;
 const int kTrayPopupPaddingHorizontal = 18;