Block keyboard and mouse input when maximize mode is activated by accelerometer.

ash/high_contrast/high_contrast_controller.cc

Index: ash/high_contrast/high_contrast_controller.cc
diff --git a/ash/high_contrast/high_contrast_controller.cc b/ash/high_contrast/high_contrast_controller.cc
index 03618c56ba3c0be7c272c0c879c9bc77a12557fb..418dd7162c1768bcd4b66a478039e4d6611b8bee 100644
--- a/ash/high_contrast/high_contrast_controller.cc
+++ b/ash/high_contrast/high_contrast_controller.cc
@@ -12,6 +12,11 @@ namespace ash {
 
 HighContrastController::HighContrastController()
     : enabled_(false) {
+  Shell::GetInstance()->AddShellObserver(this);
+}
+
+HighContrastController::~HighContrastController() {
+  Shell::GetInstance()->RemoveShellObserver(this);
 }
 
 void HighContrastController::SetEnabled(bool enabled) {
@@ -25,12 +30,12 @@ void HighContrastController::SetEnabled(bool enabled) {
   }
 }
 
-void HighContrastController::OnRootWindowAdded(aura::Window* root_window) {
-  UpdateDisplay(root_window);
-}
-
 void HighContrastController::UpdateDisplay(aura::Window* root_window) {
   root_window->layer()->SetLayerInverted(enabled_);
 }
 
+void HighContrastController::OnRootWindowAdded(aura::Window* root_window) {
+  UpdateDisplay(root_window);
+}
+
 }  // namespace ash