[CRD iOS] Add support for three-finger gestures

remoting/ios/app/host_view_controller.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_APP_HOST_VIEW_CONTROLLER_H_
 #define REMOTING_IOS_APP_HOST_VIEW_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 #include "remoting/ios/display/gl_display_handler.h"
 
 @class RemotingClient;
 
 // We don't inherit it from GLKViewController since it uses its rendering loop,
 // which will swap buffers when the GLRenderer is writing and causes screen
 // tearing issues. Instead we use GlDisplayHandler to handle the rendering loop.
 @interface HostViewController : UIViewController
 
 - (id)initWithClient:(RemotingClient*)client;
 
+- (void)showKeyboard;
+
+- (void)hideKeyboard;
+
+@property(nonatomic, readonly) RemotingClient* client;
+
 @end
 
 #endif  // REMOTING_IOS_APP_REMOTING_HOST_VIEW_CONTROLLER_H_