Added UMA stats to overview mode

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),
+      selected_grid_index_(0),
       overview_start_time_(base::Time::Now()),
-      selected_grid_index_(0) {
+      num_key_presses_(0),
+      num_items_(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;
   for (aura::Window::Windows::const_iterator iter = root_windows.begin();
        iter != root_windows.end(); iter++) {
     // Observed switchable containers for newly created windows on all root
     // windows.
     for (size_t i = 0; i < kSwitchableWindowContainerIdsLength; ++i) {
       aura::Window* container = Shell::GetContainer(*iter,
           kSwitchableWindowContainerIds[i]);
       container->AddObserver(this);
       observed_windows_.insert(container);
     }
     scoped_ptr<WindowGrid> grid(new WindowGrid(*iter, windows, this));
     if (grid->empty())
       continue;
+    num_items_ += grid->size();
     grid_list_.push_back(grid.release());
-    items += grid_list_.size();
   }
 
   DCHECK(!grid_list_.empty());
-  UMA_HISTOGRAM_COUNTS_100("Ash.WindowSelector.Items", items);
+  UMA_HISTOGRAM_COUNTS_100("Ash.WindowSelector.Items", num_items_);
 
   shell->activation_client()->AddObserver(this);
 
   // Remove focus from active window before entering overview.
   aura::client::GetFocusClient(
       Shell::GetPrimaryRootWindow())->FocusWindow(NULL);
 
   shell->PrependPreTargetHandler(this);
   shell->GetScreen()->AddObserver(this);
   shell->metrics()->RecordUserMetricsAction(UMA_WINDOW_OVERVIEW);
@@ skipping 24 matching lines @@
     settings.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
         ScopedTransformOverviewWindow::kTransitionMilliseconds));
     settings.SetPreemptionStrategy(
         ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
     (*iter)->layer()->SetOpacity(1);
     (*iter)->Show();
   }
 
   shell->RemovePreTargetHandler(this);
   shell->GetScreen()->RemoveObserver(this);
-  UMA_HISTOGRAM_MEDIUM_TIMES(
-      "Ash.WindowSelector.TimeInOverview",
-      base::Time::Now() - overview_start_time_);
+
+  size_t remaining_items = 0;
+  for (ScopedVector<WindowGrid>::iterator iter = grid_list_.begin();
+      iter != grid_list_.end(); iter++) {
+    remaining_items += (*iter)->size();
+  }
+
+  UMA_HISTOGRAM_COUNTS_100("Ash.WindowSelector.OverviewClosedItems",

[flackr, 2014/06/10 17:08:06]

nit: DCHECK(num_items_ > remaining_items) before this just to ensure if we add
items at some point we remember to update this.

[Nina, 2014/06/10 18:38:23]

Changed to >= because it's legal not to close any item.

+                           num_items_ - remaining_items);
+  UMA_HISTOGRAM_MEDIUM_TIMES("Ash.WindowSelector.TimeInOverview",
+                             base::Time::Now() - overview_start_time_);
 
   // TODO(nsatragno): Change this to OnOverviewModeEnded and move it to when
   // everything is done.
   shell->OnOverviewModeEnding();
 
   // Clearing the window list resets the ignored_by_shelf flag on the windows.
   grid_list_.clear();
   UpdateShelfVisibility();
 }
 
@@ skipping 14 matching lines @@
 
 void WindowSelector::OnKeyEvent(ui::KeyEvent* event) {
   if (event->type() != ui::ET_KEY_PRESSED)
     return;
 
   switch (event->key_code()) {
     case ui::VKEY_ESCAPE:
       CancelSelection();
       break;
     case ui::VKEY_UP:
+      num_key_presses_++;
       Move(WindowSelector::UP);
       break;
     case ui::VKEY_DOWN:
+      num_key_presses_++;
       Move(WindowSelector::DOWN);
       break;
     case ui::VKEY_RIGHT:
+      num_key_presses_++;
       Move(WindowSelector::RIGHT);
       break;
     case ui::VKEY_LEFT:
+      num_key_presses_++;
       Move(WindowSelector::LEFT);
       break;
     case ui::VKEY_RETURN:
       // Ignore if no item is selected.
       if (!grid_list_[selected_grid_index_]->is_selecting())
         return;
+      UMA_HISTOGRAM_COUNTS_100("Ash.WindowSelector.ArrowKeyPresses",
+                               num_key_presses_);
+      UMA_HISTOGRAM_CUSTOM_COUNTS(
+          "Ash.WindowSelector.KeyPressesOverItemsRatio",
+          (num_key_presses_ * 100) / num_items_, 1, 300, 30);
+      Shell::GetInstance()->metrics()->RecordUserMetricsAction(
+          UMA_WINDOW_OVERVIEW_ENTER_KEY);
       wm::GetWindowState(grid_list_[selected_grid_index_]->
                          SelectedWindow()->SelectionWindow())->Activate();
       break;
     default:
       // Not a key we are interested in.
       return;
   }
   event->StopPropagation();
 }
 
@@ skipping 131 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