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

remoting/protocol/input_event_tracker.cc

Index: remoting/protocol/input_event_tracker.cc
diff --git a/remoting/protocol/input_event_tracker.cc b/remoting/protocol/input_event_tracker.cc
index 446a4b623898424f8e94afa7ead2a3e2d66175e7..d882d60330950f6c6201522330a119ae319c6e56 100644
--- a/remoting/protocol/input_event_tracker.cc
+++ b/remoting/protocol/input_event_tracker.cc
@@ -5,6 +5,7 @@
 #include "remoting/protocol/input_event_tracker.h"
 
 #include "base/logging.h"
+#include "base/stl_util.h"
 #include "remoting/proto/event.pb.h"
 
 namespace remoting {
@@ -51,6 +52,18 @@ void InputEventTracker::ReleaseAll() {
     }
   }
   mouse_button_state_ = 0;
+
+  if (!touch_point_ids_.empty()) {
+    TouchEvent cancel_all_touch_event;
+    cancel_all_touch_event.set_event_type(TouchEvent::TOUCH_POINT_CANCEL);
+    for (uint32 touch_point_id : touch_point_ids_) {
+      TouchEventPoint* point = cancel_all_touch_event.add_touch_points();
+      point->set_id(touch_point_id);
+    }
+    input_stub_->InjectTouchEvent(cancel_all_touch_event);
+    touch_point_ids_.clear();
+  }
+  DCHECK(touch_point_ids_.empty());
 }
 
 void InputEventTracker::InjectKeyEvent(const KeyEvent& event) {
@@ -92,5 +105,28 @@ void InputEventTracker::InjectMouseEvent(const MouseEvent& event) {
   input_stub_->InjectMouseEvent(event);
 }
 
+void InputEventTracker::InjectTouchEvent(const TouchEvent& event) {
+  switch (event.event_type()) {
+    case TouchEvent::TOUCH_POINT_START:
+      for (const TouchEventPoint& touch_point : event.touch_points()) {
+        DCHECK(touch_point_ids_.find(touch_point.id()) ==
+               touch_point_ids_.end());
+        touch_point_ids_.insert(touch_point.id());
+      }
+      break;
+    case TouchEvent::TOUCH_POINT_END:
+    case TouchEvent::TOUCH_POINT_CANCEL:
+      for (const TouchEventPoint& touch_point : event.touch_points()) {
+        DCHECK(touch_point_ids_.find(touch_point.id()) !=
+               touch_point_ids_.end());
+        touch_point_ids_.erase(touch_point.id());
+      }
+      break;
+    default:
+      break;
+  }
+  input_stub_->InjectTouchEvent(event);
+}
+
 }  // namespace protocol
 }  // namespace remoting