Implement the 2016Q2 Translate UI designe spec out in

chrome/browser/ui/translate/translate_bubble_view_state_transition.cc

 // Copyright 2013 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 "chrome/browser/ui/translate/translate_bubble_view_state_transition.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 
-namespace {
-
-enum TranslateBubbleUiEvent {
-  // Bubble enters the options state.
-  SET_STATE_OPTIONS = 1,
-
-  // Bubble leaves the options state.
-  LEAVE_STATE_OPTIONS = 2,
-
-  TRANSLATE_BUBBLE_UI_EVENT_MAX
-};
-
-}  // namespace
-
 TranslateBubbleViewStateTransition::TranslateBubbleViewStateTransition(
     TranslateBubbleModel::ViewState view_state)
-    : view_state_(view_state),
-      view_state_before_advanced_view_(view_state) {
+    : view_state_(view_state), view_state_before_advanced_view_(view_state) {
   // The initial view type must not be 'Advanced'.
   DCHECK_NE(TranslateBubbleModel::VIEW_STATE_ADVANCED, view_state_);
 }
 
 void TranslateBubbleViewStateTransition::SetViewState(
     TranslateBubbleModel::ViewState view_state) {
   view_state_ = view_state;
   if (view_state != TranslateBubbleModel::VIEW_STATE_ADVANCED)
     view_state_before_advanced_view_ = view_state;
   else
-    UMA_HISTOGRAM_ENUMERATION("Translate.BubbleUiEvent", SET_STATE_OPTIONS,
-                              TRANSLATE_BUBBLE_UI_EVENT_MAX);
+    UMA_HISTOGRAM_ENUMERATION("Translate.BubbleUiEvent",
+                              translate::SET_STATE_OPTIONS,
+                              translate::TRANSLATE_BUBBLE_UI_EVENT_MAX);
 }
 
 void TranslateBubbleViewStateTransition::GoBackFromAdvanced() {
   DCHECK(view_state_ == TranslateBubbleModel::VIEW_STATE_ADVANCED);
-  UMA_HISTOGRAM_ENUMERATION("Translate.BubbleUiEvent", LEAVE_STATE_OPTIONS,
-                            TRANSLATE_BUBBLE_UI_EVENT_MAX);
+  UMA_HISTOGRAM_ENUMERATION("Translate.BubbleUiEvent",
+                            translate::LEAVE_STATE_OPTIONS,
+                            translate::TRANSLATE_BUBBLE_UI_EVENT_MAX);
   SetViewState(view_state_before_advanced_view_);
 }