Update shelf spacing in Chrome OS according to the MD specs

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 fa633cffd97a29fdd7d73e22c3b16470cf766e92..4fc18190aa5f0aef60aa7465cf9074ef2aaa8398 100644
--- a/ash/system/tray/tray_constants.h
+++ b/ash/system/tray/tray_constants.h
@@ -22,7 +22,18 @@ extern const int kBubblePaddingHorizontalSide;
 extern const int kBubblePaddingVerticalBottom;
 extern const int kBubblePaddingVerticalSide;
 
-extern const int kPaddingFromEdgeOfShelf;
+extern const int kEmptyBoarderPadding;

[bruthig, 2016/05/25 20:24:53]

sp: Boarder->Border

[yiyix, 2016/06/02 03:54:54]

Done.

+enum ShelfStatusAreaInset {
+  // Padding between the edge of the shelf and the status tray area.
+  PADDING_FROM_EDGE_OF_SHELF,
+
+  // Padding between icons in the status tray area.
+  TRAY_SPACING,
+
+  // Padding between the edge of shelf and the overview button.
+  PADDING_FROM_EDGE_TO_OVERVIEW_BUTTON,

[bruthig, 2016/05/25 20:24:53]

Remove this value and use PADDING_FROM_EDGE_OF_SHELF.

[yiyix, 2016/06/02 03:54:54]

Done.

+};
+
 extern const int kTrayBubbleAnchorTopInsetBottomAnchor;
 
 extern const int kTrayImageItemHorizontalPaddingBottomAlignment;
@@ -76,9 +87,11 @@ extern const int kTrayNotificationContentsWidth;
 extern const int kTrayAvatarCornerRadius;
 extern const int kTrayAvatarSize;
 
-extern const int kTraySpacing;
+extern const int kMessageCenterBubblePadding;
 extern const int kShelfItemHeight;
 
+int GetShelfStatusAreaInset(ShelfStatusAreaInset constant);
+
 namespace test {
 const int kSettingsTrayItemViewId = 10000;
 const int kAccessibilityTrayItemViewId = 10001;