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

ash/shell_observer.h

Index: ash/shell_observer.h
diff --git a/ash/shell_observer.h b/ash/shell_observer.h
index d1b3d8651c258597e4a2f3f0459989b23a60e36e..8c393d370ee7cfd2f9dff4a89f87cdec88ef527c 100644
--- a/ash/shell_observer.h
+++ b/ash/shell_observer.h
@@ -29,6 +29,9 @@ class ASH_EXPORT ShellObserver {
   // unlocked.
   virtual void OnLockStateChanged(bool locked) {}
 
+  // Invoked after a non-primary root window is created.
+  virtual void OnRootWindowAdded(aura::Window* root_window) {}
+
   // Invoked when the shelf alignment in |root_window| is changed.
   virtual void OnShelfAlignmentChanged(aura::Window* root_window) {}