Use stricter type checking in UMA_HISTOGRAM_ENUMERATION

ash/shelf/shelf_view.cc

 // 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.
 
 #include "ash/shelf/shelf_view.h"
 
 #include <algorithm>
 #include <memory>
 
 #include "ash/ash_constants.h"
@@ skipping 659 matching lines @@
   is_repost_event_on_same_item_ =
       IsRepostEvent(event) && (last_pressed_index_ == index);
 
   if (pointer == TOUCH)
     touch_press_time_ = base::TimeTicks::Now();
 
   CHECK_EQ(ShelfButton::kViewClassName, view->GetClassName());
   drag_view_ = static_cast<ShelfButton*>(view);
   drag_origin_ = gfx::Point(event.x(), event.y());
   UMA_HISTOGRAM_ENUMERATION("Ash.ShelfAlignmentUsage",
-                            shelf_->SelectValueForShelfAlignment(
-                                SHELF_ALIGNMENT_UMA_ENUM_VALUE_BOTTOM,
-                                SHELF_ALIGNMENT_UMA_ENUM_VALUE_LEFT,
-                                SHELF_ALIGNMENT_UMA_ENUM_VALUE_RIGHT),
+                            static_cast<ShelfAlignmentUmaEnumValue>(
+                                shelf_->SelectValueForShelfAlignment(
+                                    SHELF_ALIGNMENT_UMA_ENUM_VALUE_BOTTOM,
+                                    SHELF_ALIGNMENT_UMA_ENUM_VALUE_LEFT,
+                                    SHELF_ALIGNMENT_UMA_ENUM_VALUE_RIGHT)),
                             SHELF_ALIGNMENT_UMA_ENUM_VALUE_COUNT);
 }
 
 void ShelfView::PointerDraggedOnButton(views::View* view,
                                        Pointer pointer,
                                        const ui::LocatedEvent& event) {
   if (CanPrepareForDrag(pointer, event))
     PrepareForDrag(pointer, event);
 
   if (drag_pointer_ == pointer)
@@ skipping 1172 matching lines @@
   if (pointer == TOUCH &&
       (base::TimeTicks::Now() - touch_press_time_) <
           base::TimeDelta::FromMilliseconds(kTouchDragTimeThresholdMs)) {
     return false;
   }
 
   return true;
 }
 
 }  // namespace ash