Add MouseClampingFilter and update ClientSession to use it.

remoting/host/mouse_clamping_filter.h

Index: remoting/host/mouse_clamping_filter.h
diff --git a/remoting/host/mouse_clamping_filter.h b/remoting/host/mouse_clamping_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..ce2bae2d300e94885be084764c47b9ff77335c67
--- /dev/null
+++ b/remoting/host/mouse_clamping_filter.h
@@ -0,0 +1,39 @@
+// 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_MOUSE_CLAMPING_FILTER_H_
+#define REMOTING_HOST_MOUSE_CLAMPING_FILTER_H_
+
+#include "base/compiler_specific.h"
+#include "remoting/protocol/input_filter.h"
+
+namespace remoting {
+
+namespace protocol {
+class MouseInputFilter;
+}
+
+class VideoFrameCapturer;
+
+// InputFilter implementation which uses a target MouseInputFilter to clamp
+// mouse events to the current VideoFrameCapturer dimensions.
+class MouseClampingFilter : public protocol::InputFilter {
+ public:
+  MouseClampingFilter(VideoFrameCapturer* capturer,
+                      protocol::MouseInputFilter* input_stub);
+  virtual ~MouseClampingFilter();
+
+  // InputFilter overrides.
+  virtual void InjectMouseEvent(const protocol::MouseEvent& event) OVERRIDE;
+
+ private:
+  VideoFrameCapturer* capturer_;
+  protocol::MouseInputFilter* mouse_input_filter_;
+
+  DISALLOW_COPY_AND_ASSIGN(MouseClampingFilter);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_MOUSE_CLAMPING_FILTER_H_