Allow input & clipboard filters to be disabled without NULLing target stub.

remoting/protocol/input_filter.cc

Index: remoting/protocol/input_filter.cc
diff --git a/remoting/protocol/input_filter.cc b/remoting/protocol/input_filter.cc
index d74939137ce58059c765d0b1565cfb1647e093ed..178fde771e3bded79b5b68bb76b2487bf09a96a4 100644
--- a/remoting/protocol/input_filter.cc
+++ b/remoting/protocol/input_filter.cc
@@ -7,22 +7,23 @@
 namespace remoting {
 namespace protocol {
 
-InputFilter::InputFilter() : input_stub_(NULL) {
+InputFilter::InputFilter() : input_stub_(NULL), enabled_(true) {
 }
 
-InputFilter::InputFilter(InputStub* input_stub) : input_stub_(input_stub) {
+InputFilter::InputFilter(InputStub* input_stub)
+  : input_stub_(input_stub), enabled_(true) {
 }
 
 InputFilter::~InputFilter() {
 }
 
 void InputFilter::InjectKeyEvent(const KeyEvent& event) {
-  if (input_stub_ != NULL)
+  if (enabled_ && input_stub_ != NULL)
     input_stub_->InjectKeyEvent(event);
 }
 
 void InputFilter::InjectMouseEvent(const MouseEvent& event) {
-  if (input_stub_ != NULL)
+  if (enabled_ && input_stub_ != NULL)
     input_stub_->InjectMouseEvent(event);
 }