[CRD iOS] Add support for three-finger gestures

remoting/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_IOS_CLIENT_GESTURES_H_
 #define REMOTING_IOS_CLIENT_GESTURES_H_
 
 #import <Foundation/Foundation.h>
 #import <UIKit/UIKit.h>
 
@@ skipping 10 matching lines @@
   HostInputSchemeTouch = 1
 };
 
 typedef NS_ENUM(NSInteger, MouseButton) {
   NO_BUTTON = 0,
   LEFT_BUTTON = 1,
   MIDDLE_BUTTON = 2,
   RIGHT_BUTTON = 3,
 };
 
+@protocol ClientGesturesDelegate<NSObject>
+- (void)keyboardShouldShow;
+- (void)keyboardShouldHide;
+@end
+
 @interface ClientGestures : NSObject<UIGestureRecognizerDelegate> {
  @private
   UILongPressGestureRecognizer* _longPressRecognizer;
   UIPanGestureRecognizer* _panRecognizer;
   UIPanGestureRecognizer* _flingRecognizer;
   UIPanGestureRecognizer* _scrollRecognizer;
   UIPanGestureRecognizer* _threeFingerPanRecognizer;
   UIPinchGestureRecognizer* _pinchRecognizer;
   UITapGestureRecognizer* _singleTapRecognizer;
   UITapGestureRecognizer* _twoFingerTapRecognizer;
@@ skipping 21 matching lines @@
 - (IBAction)scrollGestureTriggered:(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;
 
+@property(weak, nonatomic) id<ClientGesturesDelegate> delegate;
+
 @end
 
 #endif  //  REMOTING_IOS_CLIENT_GESTURES_H_