Move ClientSession's input logic into separate components.

remoting/host/remote_input_filter.h

Index: remoting/host/remote_input_filter.h
diff --git a/remoting/host/remote_input_filter.h b/remoting/host/remote_input_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..2446098065564b48d4f2fe98aec5622c8f58715f
--- /dev/null
+++ b/remoting/host/remote_input_filter.h
@@ -0,0 +1,54 @@
+// 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_HOST_REMOTE_INPUT_FILTER_H_
+#define REMOTING_HOST_REMOTE_INPUT_FILTER_H_
+
+#include <list>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/time.h"
+#include "remoting/protocol/input_event_tracker.h"
+#include "remoting/protocol/input_stub.h"
+#include "third_party/skia/include/core/SkPoint.h"
+
+namespace remoting {
+
+// Filtering InputStub that filters remotely-injected input if it has been
+// notified of local input recently.
+class RemoteInputFilter : public protocol::InputStub {
+ public:
+  // Creates a filter forwarding events to the specified InputEventTracker.
+  // The filter needs a tracker to release buttons & keys when blocking input.
+  explicit RemoteInputFilter(protocol::InputEventTracker* event_tracker);
+  virtual ~RemoteInputFilter();
+
+  // Informs the filter that local mouse activity has been detected.  If the
+  // activity does not match events we injected then we assume that it is local,
+  // and block remote input for a short while.
+  void LocalMouseMoved(const SkIPoint& mouse_pos);
+
+  // InputStub overrides.
+  virtual void InjectKeyEvent(const protocol::KeyEvent& event) OVERRIDE;
+  virtual void InjectMouseEvent(const protocol::MouseEvent& event) OVERRIDE;
+
+ private:
+  bool ShouldIgnoreInput() const;
+
+  protocol::InputEventTracker* event_tracker_;
+
+  // Queue of recently-injected mouse positions used to distinguish echoes of
+  // injected events from movements from a local input device.
+  std::list<SkIPoint> injected_mouse_positions_;
+
+  // Time at which local input events were most recently observed.
+  base::TimeTicks latest_local_input_time_;
+
+  DISALLOW_COPY_AND_ASSIGN(RemoteInputFilter);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_REMOTE_INPUT_FILTER_H_