ash:Shelf - Added UMA stats for ShelfAlignment

ash/shelf/shelf_alignment_menu.cc

Index: ash/shelf/shelf_alignment_menu.cc
diff --git a/ash/shelf/shelf_alignment_menu.cc b/ash/shelf/shelf_alignment_menu.cc
index d0d381ff645af649c2823db3f30cb5cd9aad6515..bc1e7702da6615cb93abd045d23dc923091ef6b3 100644
--- a/ash/shelf/shelf_alignment_menu.cc
+++ b/ash/shelf/shelf_alignment_menu.cc
@@ -7,6 +7,7 @@
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_types.h"
 #include "ash/shell.h"
+#include "ash/shell_delegate.h"
 #include "grit/ash_strings.h"
 #include "ui/aura/root_window.h"
 #include "ui/base/l10n/l10n_util.h"
@@ -54,14 +55,20 @@ bool ShelfAlignmentMenu::GetAcceleratorForCommandId(
 void ShelfAlignmentMenu::ExecuteCommand(int command_id, int event_flags) {
   switch (static_cast<MenuItem>(command_id)) {
     case MENU_ALIGN_LEFT:
+      Shell::GetInstance()->delegate()->RecordUserMetricsAction(
+          UMA_SHELF_ALIGNMENT_SET_LEFT);
       Shell::GetInstance()->SetShelfAlignment(SHELF_ALIGNMENT_LEFT,
                                               root_window_);
       break;
     case MENU_ALIGN_BOTTOM:
+      Shell::GetInstance()->delegate()->RecordUserMetricsAction(
+          UMA_SHELF_ALIGNMENT_SET_BOTTOM);
       Shell::GetInstance()->SetShelfAlignment(SHELF_ALIGNMENT_BOTTOM,
                                               root_window_);
       break;
     case MENU_ALIGN_RIGHT:
+      Shell::GetInstance()->delegate()->RecordUserMetricsAction(
+          UMA_SHELF_ALIGNMENT_SET_RIGHT);
       Shell::GetInstance()->SetShelfAlignment(SHELF_ALIGNMENT_RIGHT,
                                               root_window_);
       break;