Only block internal touchpad and allow external mice to continue working in maximize mode.

ash/wm/maximize_mode/maximize_mode_event_blocker.h

Index: ash/wm/maximize_mode/maximize_mode_event_blocker.h
diff --git a/ash/wm/maximize_mode/maximize_mode_event_blocker.h b/ash/wm/maximize_mode/maximize_mode_event_blocker.h
index 9e4a1a0bfa043fadc7e26af67621c719a8c173f6..725959bcf392a85fee21935f98026606833a1604 100644
--- a/ash/wm/maximize_mode/maximize_mode_event_blocker.h
+++ b/ash/wm/maximize_mode/maximize_mode_event_blocker.h
@@ -5,8 +5,11 @@
 #ifndef ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_EVENT_BLOCKER_H_
 #define ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_EVENT_BLOCKER_H_
 
+#include <set>
+
 #include "ash/shell_observer.h"
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "ui/aura/scoped_window_targeter.h"
 
@@ -16,6 +19,8 @@ class Window;
 
 namespace ash {
 
+class InternalInputDeviceList;
+
 // A class which blocks mouse and keyboard events while instantiated by
 // replacing the root window event targeter.
 class MaximizeModeEventBlocker : public ShellObserver {
@@ -31,6 +36,7 @@ class MaximizeModeEventBlocker : public ShellObserver {
   void AddEventTargeterOn(aura::Window* root_window);
 
   ScopedVector<aura::ScopedWindowTargeter> targeters_;
+  scoped_ptr<InternalInputDeviceList> internal_devices_;
 
   DISALLOW_COPY_AND_ASSIGN(MaximizeModeEventBlocker);
 };