Block internal PlatformEvents before they are dispatched in touchview.

ash/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_x11.h

+// Copyright 2014 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.
+
+#ifndef ASH_WM_MAXIMIZE_MODE_SCOPED_DISABLE_INTERNAL_MOUSE_AND_KEYBOARD_X11_H_
+#define ASH_WM_MAXIMIZE_MODE_SCOPED_DISABLE_INTERNAL_MOUSE_AND_KEYBOARD_X11_H_
+
+#include <vector>
+
+#include "ash/ash_export.h"
+#include "base/macros.h"
+#include "ui/events/platform/platform_event_observer.h"
+#include "ui/gfx/point.h"
+
+namespace ash {
+
+class ScopedDisableInternalMouseAndKeyboard {
+ public:
+  virtual ~ScopedDisableInternalMouseAndKeyboard() {}
+};
+
+// Identifies which input devices are internal and provides a helper function to
+// test if an input event came from an internal device.
+class ScopedDisableInternalMouseAndKeyboardX11
+    : public ScopedDisableInternalMouseAndKeyboard,
+      public ui::PlatformEventObserver {
+ public:
+  ScopedDisableInternalMouseAndKeyboardX11();
+  virtual ~ScopedDisableInternalMouseAndKeyboardX11();
+
+  // ui::PlatformEventObserver:
+  virtual void WillProcessEvent(const ui::PlatformEvent& event) OVERRIDE;
+  virtual void DidProcessEvent(const ui::PlatformEvent& event) OVERRIDE;
+ private:
+  int touchpad_device_id_;
+  int keyboard_device_id_;
+
+  // Tracks the last known mouse cursor location caused before blocking the
+  // internal touchpad or caused by an external mouse.
+  gfx::Point last_mouse_location_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedDisableInternalMouseAndKeyboardX11);
+};
+
+}  // namespace ash
+
+#endif // ASH_WM_MAXIMIZE_MODE_SCOPED_DISABLE_INTERNAL_MOUSE_AND_KEYBOARD_X11_H_