Move ClientSession's input logic into separate components.

remoting/protocol/input_event_tracker.h

Index: remoting/protocol/input_event_tracker.h
diff --git a/remoting/protocol/input_event_tracker.h b/remoting/protocol/input_event_tracker.h
new file mode 100644
index 0000000000000000000000000000000000000000..2eef074d27bbf7b35fb01abd287565f355a630ad
--- /dev/null
+++ b/remoting/protocol/input_event_tracker.h
@@ -0,0 +1,48 @@
+// Copyright (c) 2012 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_INPUT_EVENT_TRACKER_H_
+#define REMOTING_PROTOCOL_INPUT_EVENT_TRACKER_H_
+
+#include <set>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "remoting/protocol/input_stub.h"
+#include "third_party/skia/include/core/SkPoint.h"
+
+namespace remoting {
+namespace protocol {
+
+// Filtering InputStub which tracks mouse and keyboard input events before
+// passing them on to |input_stub|, and can dispatch release events to
+// |input_stub| for all currently-pressed keys and buttons when necessary.
+class InputEventTracker : public InputStub {
+ public:
+  explicit InputEventTracker(protocol::InputStub* input_stub);
+  virtual ~InputEventTracker();
+
+  // Dispatch release events for all currently-pressed keys and mouse buttons
+  // to the InputStub.
+  void ReleaseAll();
+
+  // 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_;
+
+  SkIPoint mouse_pos_;
+  uint32 mouse_button_state_;
+
+  DISALLOW_COPY_AND_ASSIGN(InputEventTracker);
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_INPUT_EVENT_TRACKER_H_