Fixed Ash.WindowSelector.TimeInOverview UMA metric reporting wrong time.

ash/wm/overview/window_selector.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 "ash/wm/overview/window_selector.h"
 
 #include <algorithm>
 
 #include "ash/accessibility_delegate.h"
 #include "ash/ash_switches.h"
@@ skipping 77 matching lines @@
 }
 
 }  // namespace
 
 WindowSelector::WindowSelector(const WindowList& windows,
                                WindowSelectorDelegate* delegate)
     : delegate_(delegate),
       restore_focus_window_(aura::client::GetFocusClient(
           Shell::GetPrimaryRootWindow())->GetFocusedWindow()),
       ignore_activations_(false),
+      overview_start_time_(base::Time::Now()),
       selected_grid_index_(0) {
   DCHECK(delegate_);
   Shell* shell = Shell::GetInstance();
   shell->OnOverviewModeStarting();
 
   if (restore_focus_window_)
     restore_focus_window_->AddObserver(this);
 
   const aura::Window::Windows root_windows = Shell::GetAllRootWindows();
   size_t items = 0;
@@ skipping 257 matching lines @@
     // root window, identify it and call Move() on it to initialize the
     // selection widget.
     // TODO(nsatragno): If there are more than two monitors, move between grids
     // in the requested direction.
     selected_grid_index_ = (selected_grid_index_ + 1) % grid_list_.size();
     grid_list_[selected_grid_index_]->Move(direction);
   }
 }
 
 }  // namespace ash