Add MouseClampingFilter and update ClientSession to use it.

remoting/host/mouse_clamping_filter.cc

Index: remoting/host/mouse_clamping_filter.cc
diff --git a/remoting/host/mouse_clamping_filter.cc b/remoting/host/mouse_clamping_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2d1a7ffc082baf2bb258851aabd62c8df95a6f96
--- /dev/null
+++ b/remoting/host/mouse_clamping_filter.cc
@@ -0,0 +1,27 @@
+// 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.
+
+#include "remoting/host/mouse_clamping_filter.h"
+
+#include "remoting/host/video_frame_capturer.h"
+#include "remoting/proto/event.pb.h"
+
+namespace remoting {
+
+MouseClampingFilter::MouseClampingFilter(VideoFrameCapturer* capturer,
+                                         protocol::InputStub* input_stub)
+  : MouseInputFilter(input_stub), capturer_(capturer) {
+}
+
+MouseClampingFilter::~MouseClampingFilter() {
+}
+
+void MouseClampingFilter::InjectMouseEvent(const protocol::MouseEvent& event) {
+  // Ensure that the MouseInputFilter is clamping to the current dimensions.
+  set_output_size(capturer_->size_most_recent());
+  set_input_size(capturer_->size_most_recent());
+  MouseInputFilter::InjectMouseEvent(event);
+}
+
+}  // namespace remoting