[Remoting iOS] Basic viewport manipulation support

remoting/client/ios/session/remoting_client.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_SESSION_REMOTING_CLIENT_H_
 #define REMOTING_CLIENT_IOS_SESSION_REMOTING_CLIENT_H_
 
 #import <Foundation/Foundation.h>
 
 #include "remoting/protocol/connection_to_host.h"
 
+namespace remoting {
+
+class GestureInterpreter;
+
+}  // namespace remoting
+
 @class HostInfo;
 @class GlDisplayHandler;
 
 // A list of notifications that will be sent out for different types of Remoting
 // Client events.
 //
 extern NSString* const kHostSessionStatusChanged;
 extern NSString* const kHostSessionPinProvided;
 
 // List of keys in user info from events.
@@ skipping 30 matching lines @@
                              scope:(NSString*)scope;
 
 - (void)setCapabilities:(NSString*)capabilities;
 
 - (void)handleExtensionMessageOfType:(NSString*)type message:(NSString*)message;
 
 // The display handler tied to the remoting client used to display the host.
 @property(nonatomic, strong) GlDisplayHandler* displayHandler;
 // The host info used to make the remoting client connection.
 @property(nonatomic, readonly) HostInfo* hostInfo;
+// The gesture interpreter used to handle gestures.
+// This is valid only after the client has connected to the host. Always use
+// RemotingClient.gestureInterpreter instead of storing the pointer separately.
+@property(nonatomic, readonly) remoting::GestureInterpreter* gestureInterpreter;
 
 @end
 
 #endif  // REMOTING_CLIENT_IOS_SESSION_REMOTING_CLIENT_H_