Added quick lock mechanism while in Touchview

ash/wm/maximize_mode/maximize_mode_controller.cc

Index: ash/wm/maximize_mode/maximize_mode_controller.cc
diff --git a/ash/wm/maximize_mode/maximize_mode_controller.cc b/ash/wm/maximize_mode/maximize_mode_controller.cc
index a32812ab46688111e7ac0db0724142e5431a6dc9..076e064f5689e2cb861e772eafe5631dc3c699b7 100644
--- a/ash/wm/maximize_mode/maximize_mode_controller.cc
+++ b/ash/wm/maximize_mode/maximize_mode_controller.cc
@@ -17,7 +17,6 @@
 #include "base/metrics/histogram.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/events/event.h"
-#include "ui/events/event_handler.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 #include "ui/gfx/vector3d_f.h"
 
@@ -92,47 +91,6 @@ float ClockwiseAngleBetweenVectorsInDegrees(const gfx::Vector3dF& base,
   return angle;
 }
 
-#if defined(OS_CHROMEOS)
-
-// An event handler which listens for a volume down + power keypress and
-// triggers a screenshot when this is seen.
-class ScreenshotActionHandler : public ui::EventHandler {
- public:
-  ScreenshotActionHandler();
-  virtual ~ScreenshotActionHandler();
-
-  // ui::EventHandler:
-  virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
-
- private:
-  bool volume_down_pressed_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScreenshotActionHandler);
-};
-
-ScreenshotActionHandler::ScreenshotActionHandler()
-    : volume_down_pressed_(false) {
-  Shell::GetInstance()->PrependPreTargetHandler(this);
-}
-
-ScreenshotActionHandler::~ScreenshotActionHandler() {
-  Shell::GetInstance()->RemovePreTargetHandler(this);
-}
-
-void ScreenshotActionHandler::OnKeyEvent(ui::KeyEvent* event) {
-  if (event->key_code() == ui::VKEY_VOLUME_DOWN) {
-    volume_down_pressed_ = event->type() == ui::ET_KEY_PRESSED ||
-                           event->type() == ui::ET_TRANSLATED_KEY_PRESS;
-  } else if (volume_down_pressed_ &&
-             event->key_code() == ui::VKEY_POWER &&
-             event->type() == ui::ET_KEY_PRESSED) {
-    Shell::GetInstance()->accelerator_controller()->PerformAction(
-        ash::TAKE_SCREENSHOT, ui::Accelerator());
-  }
-}
-
-#endif  // OS_CHROMEOS
-
 }  // namespace
 
 MaximizeModeController::MaximizeModeController()
@@ -351,9 +309,6 @@ void MaximizeModeController::EnterMaximizeMode() {
       GetDisplayInfo(gfx::Display::InternalDisplayId()).rotation();
   EnableMaximizeModeWindowManager(true);
   event_blocker_.reset(new MaximizeModeEventBlocker);
-#if defined(OS_CHROMEOS)
-  event_handler_.reset(new ScreenshotActionHandler);
-#endif
   Shell::GetInstance()->display_controller()->AddObserver(this);
 }
 
@@ -366,7 +321,6 @@ void MaximizeModeController::LeaveMaximizeMode() {
   rotation_locked_ = false;
   EnableMaximizeModeWindowManager(false);
   event_blocker_.reset();
-  event_handler_.reset();
 }
 
 void MaximizeModeController::OnSuspend() {