[CRD iOS] Ignore touch event when the touch point is out of the canvas in direct input mode

remoting/client/ui/direct_input_strategy.cc

Index: remoting/client/ui/direct_input_strategy.cc
diff --git a/remoting/client/ui/direct_input_strategy.cc b/remoting/client/ui/direct_input_strategy.cc
index f749fe3f963df2f968d2aace87e5b36e215e54ad..d84e7754068a29cbc5d8f933e83ac9cf12a7076a 100644
--- a/remoting/client/ui/direct_input_strategy.cc
+++ b/remoting/client/ui/direct_input_strategy.cc
@@ -41,10 +41,15 @@ bool DirectInputStrategy::HandlePan(const ViewMatrix::Vector2D& translation,
   return false;
 }
 
-void DirectInputStrategy::TrackTouchInput(const ViewMatrix::Point& touch_point,
+bool DirectInputStrategy::TrackTouchInput(const ViewMatrix::Point& touch_point,
                                           const DesktopViewport& viewport) {
-  cursor_position_ =
+  ViewMatrix::Point new_position =
       viewport.GetTransformation().Invert().MapPoint(touch_point);
+  if (!viewport.IsPointWithinDesktopBounds(new_position)) {
+    return false;
+  }
+  cursor_position_ = new_position;
+  return true;
 }
 
 ViewMatrix::Point DirectInputStrategy::GetCursorPosition() const {