[CRD iOS] Add support for three-finger gestures

remoting/ios/app/host_view_controller.mm

 // 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.
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 #import "remoting/ios/app/host_view_controller.h"
 
@@ skipping 80 matching lines @@
 }
 
 - (void)viewDidDisappear:(BOOL)animated {
   [super viewDidDisappear:animated];
   [(GLKView*)self.view deleteDrawable];
 }
 
 - (void)viewWillAppear:(BOOL)animated {
   [super viewWillAppear:animated];
 
-  _clientGestures =
-      [[ClientGestures alloc] initWithView:self.view client:_client];
+  _clientGestures = [[ClientGestures alloc] initWithHostViewController:self];
   [[NSNotificationCenter defaultCenter]
       addObserver:self
          selector:@selector(keyboardWillShow:)
              name:UIKeyboardWillShowNotification
            object:nil];
 
   [[NSNotificationCenter defaultCenter]
       addObserver:self
          selector:@selector(keyboardWillHide:)
              name:UIKeyboardWillHideNotification
@@ skipping 149 matching lines @@
   alert.popoverPresentationController.sourceView = self.view;
   // Target the alert menu at the top middle of the FAB.
   alert.popoverPresentationController.sourceRect = CGRectMake(
       _floatingButton.center.x, _floatingButton.frame.origin.y, 1.0, 1.0);
 
   alert.popoverPresentationController.permittedArrowDirections =
       UIPopoverArrowDirectionDown;
   [self presentViewController:alert animated:YES completion:nil];
 }
 
+#pragma mark properties
+
+- (RemotingClient*)client {
+  return _client;
+}
+
 @end