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

remoting/client/ui/desktop_viewport.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_CLIENT_UI_DESKTOP_VIEWPORT_H_
 #define REMOTING_CLIENT_UI_DESKTOP_VIEWPORT_H_
 
 #include "base/callback.h"
 #include "remoting/client/ui/view_matrix.h"
 
@@ skipping 39 matching lines @@
 
   // Moves the viewport center by <x, y> on the desktop's coordinate.
   void MoveViewport(float dx, float dy);
 
   // Sets the viewport center to (x, y) on the desktop's coordinate.
   void SetViewportCenter(float x, float y);
 
   // 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(
       const ViewMatrix::Point& point) const;
 
   // Registers the callback to be called once the transformation has changed.
   // run_immediately: If true and the viewport is ready to be used, the callback
   //     will be called immedately with the transformation matrix.
   void RegisterOnTransformationChangedCallback(
       const TransformationCallback& callback,
@@ skipping 43 matching lines @@
 
   TransformationCallback on_transformation_changed_;
 
   // DesktopViewport is neither copyable nor movable.
   DesktopViewport(const DesktopViewport&) = delete;
   DesktopViewport& operator=(const DesktopViewport&) = delete;
 };
 
 }  // namespace remoting
 #endif  // REMOTING_CLIENT_UI_DESKTOP_VIEWPORT_H_