Add UMA for app list creation time.

ui/app_list/views/app_list_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 "ui/app_list/views/app_list_view.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
+#include "base/metrics/histogram.h"
 #include "base/strings/string_util.h"
 #include "base/win/windows_version.h"
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_model.h"
 #include "ui/app_list/app_list_switches.h"
 #include "ui/app_list/app_list_view_delegate.h"
 #include "ui/app_list/speech_ui_model.h"
 #include "ui/app_list/views/app_list_background.h"
 #include "ui/app_list/views/app_list_folder_view.h"
 #include "ui/app_list/views/app_list_main_view.h"
@@ skipping 292 matching lines @@
       ->apps_container_view()
       ->apps_grid_view()
       ->pagination_model();
 }
 
 void AppListView::InitAsBubbleInternal(gfx::NativeView parent,
                                        int initial_apps_page,
                                        views::BubbleBorder::Arrow arrow,
                                        bool border_accepts_events,
                                        const gfx::Vector2d& anchor_offset) {
+  base::Time start_time = base::Time::Now();
+
   app_list_main_view_ =
       new AppListMainView(delegate_, initial_apps_page, parent);
   AddChildView(app_list_main_view_);
   app_list_main_view_->SetPaintToLayer(true);
   app_list_main_view_->SetFillsBoundsOpaquely(false);
   app_list_main_view_->layer()->SetMasksToBounds(true);
 
   // Speech recognition is available only when the start page exists.
   if (delegate_ && delegate_->IsSpeechRecognitionEnabled()) {
     speech_view_ = new SpeechView(delegate_);
@@ skipping 68 matching lines @@
   // corner radius 1px smaller than the outer border, so it just reaches but
   // doesn't cover it.
   const int kOverlayCornerRadius =
       GetBubbleFrameView()->bubble_border()->GetBorderCornerRadius();
   overlay_view_->set_background(new AppListOverlayBackground(
       kOverlayCornerRadius - (SupportsShadow() ? 0 : 1)));
   AddChildView(overlay_view_);
 
   if (delegate_)
     delegate_->ViewInitialized();
+
+  UMA_HISTOGRAM_TIMES("Apps.AppListCreationTime",
+                      base::Time::Now() - start_time);
 }
 
 void AppListView::OnBeforeBubbleWidgetInit(
     views::Widget::InitParams* params,
     views::Widget* widget) const {
 #if defined(USE_AURA) && !defined(OS_CHROMEOS)
   if (delegate_ && delegate_->ForceNativeDesktop())
     params->native_widget = new views::DesktopNativeWidgetAura(widget);
 #endif
 #if defined(OS_WIN)
@@ skipping 164 matching lines @@
       speech_view_->layer()->SetTransform(speech_transform);
   }
 
   if (will_appear)
     speech_view_->SetVisible(true);
   else
     app_list_main_view_->SetVisible(true);
 }
 
 }  // namespace app_list