Add window overview mode behind --ash-enable-overview-mode flag to F5 key.

ash/accelerators/accelerator_controller.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/accelerators/accelerator_controller.h"
 
 #include <algorithm>
 #include <cmath>
 #include <iostream>
 #include <string>
@@ skipping 77 matching lines @@
 bool HandleCycleWindowMRU(WindowCycleController::Direction direction,
                           bool is_alt_down) {
   Shell::GetInstance()->
       window_cycle_controller()->HandleCycleWindow(direction, is_alt_down);
   // Always report we handled the key, even if the window didn't change.
   return true;
 }
 
 void HandleCycleWindowLinear(CycleDirection direction) {
   Shell::GetInstance()->
-        window_cycle_controller()->HandleLinearCycleWindow();
+      window_cycle_controller()->HandleLinearCycleWindow();
+}
+
+void ToggleOverviewMode() {
+  Shell::GetInstance()->window_cycle_controller()->ToggleOverview();
 }
 
 bool HandleAccessibleFocusCycle(bool reverse) {
   if (!Shell::GetInstance()->delegate()->IsSpokenFeedbackEnabled())
     return false;
   aura::Window* active_window = ash::wm::GetActiveWindow();
   if (!active_window)
     return false;
   views::Widget* widget =
       views::Widget::GetWidgetForNativeWindow(active_window);
@@ skipping 405 matching lines @@
       if (key_code == ui::VKEY_TAB)
         shell->delegate()->RecordUserMetricsAction(UMA_ACCEL_PREVWINDOW_TAB);
       return HandleCycleWindowMRU(WindowCycleController::BACKWARD,
                                   accelerator.IsAltDown());
     case CYCLE_FORWARD_MRU:
       if (key_code == ui::VKEY_TAB)
         shell->delegate()->RecordUserMetricsAction(UMA_ACCEL_NEXTWINDOW_TAB);
       return HandleCycleWindowMRU(WindowCycleController::FORWARD,
                                   accelerator.IsAltDown());
     case CYCLE_BACKWARD_LINEAR:
+      if (CommandLine::ForCurrentProcess()->HasSwitch(
+              switches::kAshEnableOverviewMode)) {
+        shell->delegate()->RecordUserMetricsAction(UMA_ACCEL_OVERVIEW_F5);
+        ToggleOverviewMode();
+        return true;
+      }
       if (key_code == ui::VKEY_MEDIA_LAUNCH_APP1)
         shell->delegate()->RecordUserMetricsAction(UMA_ACCEL_PREVWINDOW_F5);
       HandleCycleWindowLinear(CYCLE_BACKWARD);
       return true;
     case CYCLE_FORWARD_LINEAR:
+      if (CommandLine::ForCurrentProcess()->HasSwitch(
+              switches::kAshEnableOverviewMode)) {
+        shell->delegate()->RecordUserMetricsAction(UMA_ACCEL_OVERVIEW_F5);
+        ToggleOverviewMode();
+        return true;
+      }
       if (key_code == ui::VKEY_MEDIA_LAUNCH_APP1)
         shell->delegate()->RecordUserMetricsAction(UMA_ACCEL_NEXTWINDOW_F5);
       HandleCycleWindowLinear(CYCLE_FORWARD);
       return true;
 #if defined(OS_CHROMEOS)
     case ADD_REMOVE_DISPLAY:
       Shell::GetInstance()->display_manager()->AddRemoveDisplay();
       return true;
     case TOGGLE_MIRROR_MODE:
       Shell::GetInstance()->display_controller()->ToggleMirrorMode();
@@ skipping 429 matching lines @@
     keyboard_brightness_control_delegate) {
   keyboard_brightness_control_delegate_ =
       keyboard_brightness_control_delegate.Pass();
 }
 
 bool AcceleratorController::CanHandleAccelerators() const {
   return true;
 }
 
 }  // namespace ash