[Remoting iOS] Basic viewport manipulation support

remoting/client/ios/client_gestures.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_IOS_CLIENT_GESTURES_H_
 #define REMOTING_CLIENT_IOS_CLIENT_GESTURES_H_
 
 #import <Foundation/Foundation.h>
 #import <UIKit/UIKit.h>
 #include "base/logging.h"
+#include "remoting/client/desktop_viewport.h"
 #import "remoting/client/ios/key_input.h"
 
 typedef NS_ENUM(NSInteger, HostInputScheme) {
   // Mouse cursor is shown
   // Dragging or Panning, moves the mouse cursor
   // Tapping causes mouse input at the cursor location
   HostInputSchemeTrackpad = 0,  // Default
   // Mouse cursor is not shown
   // Dragging or Panning is similar to a map
   // Tapping causes mouse input at the tap location
@@ skipping 14 matching lines @@
   UILongPressGestureRecognizer* _longPressRecognizer;
   UIPanGestureRecognizer* _panRecognizer;
   UIPanGestureRecognizer* _threeFingerPanRecognizer;
   UIPinchGestureRecognizer* _pinchRecognizer;
   UITapGestureRecognizer* _singleTapRecognizer;
   UITapGestureRecognizer* _twoFingerTapRecognizer;
   UITapGestureRecognizer* _threeFingerTapRecognizer;
   UIScreenEdgePanGestureRecognizer* _edgeGesture;
   UISwipeGestureRecognizer* _swipeGesture;
 
+  __weak UIView* _view;
+  remoting::DesktopViewport* _viewport;
+
   HostInputScheme _inputScheme;
 }
 
-- (instancetype)initWithView:(UIView*)view;
+- (instancetype)initWithView:(UIView*)view
+                    viewport:(remoting::DesktopViewport*)vp;
 
 // Zoom in/out
 - (IBAction)pinchGestureTriggered:(UIPinchGestureRecognizer*)sender;
 // Left mouse click, moves cursor
 - (IBAction)tapGestureTriggered:(UITapGestureRecognizer*)sender;
 // Scroll the view in 2d
 - (IBAction)panGestureTriggered:(UIPanGestureRecognizer*)sender;
 // Right mouse click and drag, moves cursor
 - (IBAction)longPressGestureTriggered:(UILongPressGestureRecognizer*)sender;
 // Right mouse click
 - (IBAction)twoFingerTapGestureTriggered:(UITapGestureRecognizer*)sender;
 // Middle mouse click
 - (IBAction)threeFingerTapGestureTriggered:(UITapGestureRecognizer*)sender;
 // Show hidden menus.  Swipe up for keyboard, swipe down for navigation menu
 - (IBAction)threeFingerPanGestureTriggered:(UIPanGestureRecognizer*)sender;
 
 @end
 
 #endif  //  REMOTING_CLIENT_IOS_CLIENT_GESTURES_H_