Move ClientSession's input logic into separate components.

remoting/protocol/key_event_tracker.h

-// Copyright (c) 2011 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 REMOTING_PROTOCOL_KEY_EVENT_TRACKER_H_
-#define REMOTING_PROTOCOL_KEY_EVENT_TRACKER_H_
-
-#include <set>
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "remoting/protocol/input_stub.h"
-
-namespace remoting {
-namespace protocol {
-
-// Filtering InputStub which tracks key press and release events before passing
-// them on to |input_stub|, and can dispatch release events to |input_stub| for
-// all currently-pressed keys when necessary.
-class KeyEventTracker : public InputStub {
- public:
-  KeyEventTracker(protocol::InputStub* input_stub);
-  virtual ~KeyEventTracker();
-
-  // Dispatch release events for all currently-pressed keys to the InputStub.
-  void ReleaseAllKeys();
-
-  // InputStub interface.
-  virtual void InjectKeyEvent(const KeyEvent& event) OVERRIDE;
-  virtual void InjectMouseEvent(const MouseEvent& event) OVERRIDE;
-
- private:
-  protocol::InputStub* input_stub_;
-
-  std::set<int> pressed_keys_;
-
-  DISALLOW_COPY_AND_ASSIGN(KeyEventTracker);
-};
-
-}  // namespace protocol
-}  // namespace remoting
-
-#endif  // REMOTING_PROTOCOL_KEY_EVENT_TRACKER_H_