Add touch events to the protocol, the stub layer, and to the client plugin.

remoting/host/input_injector_mac.cc

Index: remoting/host/input_injector_mac.cc
diff --git a/remoting/host/input_injector_mac.cc b/remoting/host/input_injector_mac.cc
index d3b96d8c53d59ec476cc0363ac83ed1f94ce9084..28c8b4b1788d9a8a4234b019f6b5d0f31eb38a7d 100644
--- a/remoting/host/input_injector_mac.cc
+++ b/remoting/host/input_injector_mac.cc
@@ -54,6 +54,7 @@ using protocol::ClipboardEvent;
 using protocol::KeyEvent;
 using protocol::TextEvent;
 using protocol::MouseEvent;
+using protocol::TouchEvent;
 
 // A class to generate events on Mac.
 class InputInjectorMac : public InputInjector {
@@ -69,6 +70,7 @@ class InputInjectorMac : public InputInjector {
   void InjectKeyEvent(const KeyEvent& event) override;
   void InjectTextEvent(const TextEvent& event) override;
   void InjectMouseEvent(const MouseEvent& event) override;
+  void InjectTouchEvent(const TouchEvent& event) override;
 
   // InputInjector interface.
   void Start(scoped_ptr<protocol::ClipboardStub> client_clipboard) override;
@@ -136,6 +138,10 @@ void InputInjectorMac::InjectMouseEvent(const MouseEvent& event) {
   core_->InjectMouseEvent(event);
 }
 
+void InputInjectorMac::InjectTouchEvent(const TouchEvent& event) {
+  NOTIMPLEMENTED() << "Raw touch event injection not implemented for Mac.";
+}
+
 void InputInjectorMac::Start(
     scoped_ptr<protocol::ClipboardStub> client_clipboard) {
   core_->Start(client_clipboard.Pass());