ash:Shelf - Added UMA stats for ShelfAlignment

ash/shell.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/shell.h"
 
 #include <algorithm>
 #include <string>
 
 #include "ash/accelerators/accelerator_controller.h"
@@ skipping 545 matching lines @@
   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_ALTERNATE, screen_);
   if (!gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE))
     gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, screen_);
   display_controller_.reset(new DisplayController);
 #if defined(OS_CHROMEOS) && defined(USE_X11)
   bool is_panel_fitting_disabled =
       content::GpuDataManager::GetInstance()->IsFeatureBlacklisted(
           gpu::GPU_FEATURE_TYPE_PANEL_FITTING);
 
   output_configurator_->Init(!is_panel_fitting_disabled);
+  periodic_metrics_recorder_.reset(new PeriodicMetricsRecorder);
 
   base::MessagePumpX11::Current()->AddDispatcherForRootWindow(
       output_configurator());
   // We can't do this with a root window listener because XI_HierarchyChanged
   // messages don't have a target window.
   base::MessagePumpX11::Current()->AddObserver(output_configurator());
 #endif  // defined(OS_CHROMEOS)
 
 #if defined(OS_CHROMEOS)
   internal::PowerStatus::Initialize();
@@ skipping 413 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // Shell, aura::client::ActivationChangeObserver implementation:
 
 void Shell::OnWindowActivated(aura::Window* gained_active,
                               aura::Window* lost_active) {
   if (gained_active)
     target_root_window_ = gained_active->GetRootWindow();
 }
 
 }  // namespace ash