Update shelf spacing in Chrome OS according to the MD specs

ash/shelf/shelf_layout_manager.h

Index: ash/shelf/shelf_layout_manager.h
diff --git a/ash/shelf/shelf_layout_manager.h b/ash/shelf/shelf_layout_manager.h
index 505a65bf424d5ed77bf1e90c46af5488e0ab484a..8cadb3caee8600f8cdf9f33db788905b3cff1ab7 100644
--- a/ash/shelf/shelf_layout_manager.h
+++ b/ash/shelf/shelf_layout_manager.h
@@ -67,20 +67,11 @@ class ASH_EXPORT ShelfLayoutManager
       public SnapToPixelLayoutManager,
       public SessionStateObserver {
  public:
-  // We reserve a small area on the edge of the workspace area to ensure that
-  // the resize handle at the edge of the window can be hit.
-  static const int kWorkspaceAreaVisibleInset;
-
-  // When autohidden we extend the touch hit target onto the screen so that the
-  // user can drag the shelf out.
-  static const int kWorkspaceAreaAutoHideInset;
-
-  // Size of the shelf when auto-hidden.
-  static const int kAutoHideSize;
-
-  // Inset between the inner edge of the shelf (towards centre of screen), and
-  // the shelf items, notifications, status area etc.
-  static const int kShelfItemInset;
+  enum ShelfItemInset {
+    // Inset between the inner edge of the shelf (towards centre of screen), and
+    // the shelf items, notifications, status area etc.
+    SHELF_ITEM_INSET,

[bruthig, 2016/05/25 20:24:52]

Can this be moved to the ShelfLayoutConstants enum instead?

+  };
 
   explicit ShelfLayoutManager(ShelfWidget* shelf);
   ~ShelfLayoutManager() override;
@@ -214,6 +205,8 @@ class ASH_EXPORT ShelfLayoutManager
   // available work area from the top of the screen.
   void SetChromeVoxPanelHeight(int height);
 
+  static int GetShelfItemInset(ShelfLayoutManager::ShelfItemInset constant);
+
  private:
   class AutoHideEventFilter;
   class RootWindowControllerObserverImpl;