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

remoting/client/ui/desktop_viewport.h

Index: remoting/client/ui/desktop_viewport.h
diff --git a/remoting/client/ui/desktop_viewport.h b/remoting/client/ui/desktop_viewport.h
index 56c1a69f30879ad753062e130464d7e7379718da..c000ba4b05d02bacf946ee9eb0907dd4dc3f0ec6 100644
--- a/remoting/client/ui/desktop_viewport.h
+++ b/remoting/client/ui/desktop_viewport.h
@@ -57,6 +57,9 @@ class DesktopViewport {
   // Returns the current center of the viewport on the desktop's coordinate.
   ViewMatrix::Point GetViewportCenter() const;
 
+  // Returns true if |point| is within the bounds of the desktop.
+  bool IsPointWithinDesktopBounds(const ViewMatrix::Point& point) const;
+
   // Constrains |point| within the bounds of the desktop. Do nothing if the
   // desktop size is not set.
   ViewMatrix::Point ConstrainPointToDesktop(