ash:Shelf - Added UMA stats for ShelfAlignment

ash/launcher/launcher.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_LAUNCHER_LAUNCHER_H_
 #define ASH_LAUNCHER_LAUNCHER_H_
 
 #include "ash/ash_export.h"
 #include "ash/launcher/launcher_types.h"
 #include "ash/shelf/shelf_types.h"
@@ skipping 96 matching lines @@
   void SetShelfViewBounds(gfx::Rect bounds);
   gfx::Rect GetShelfViewBounds() const;
 
   // Returns rectangle bounding all visible launcher items. Used screen
   // coordinate system.
   gfx::Rect GetVisibleItemsBoundsInScreen() const;
 
   // Returns ApplicationDragAndDropHost for this Launcher.
   app_list::ApplicationDragAndDropHost* GetDragAndDropHostForAppList();
 
+  // Record the current shelf alignment state to the named UMA_HISTOGRAM.
+  void RecordCurrentAlignmentForUMAHistogram(const char* histogram_name);
+
  private:
   friend class ash::test::LauncherTestAPI;
 
   // ShelfView used to display icons.
   internal::ShelfView* shelf_view_;
 
   ShelfAlignment alignment_;
 
   LauncherDelegate* delegate_;
 
   ShelfWidget* shelf_widget_;
 
   DISALLOW_COPY_AND_ASSIGN(Launcher);
 };
 
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_H_