[Remoting iOS] Basic viewport manipulation support

remoting/client/ios/session/remoting_client.mm

Index: remoting/client/ios/session/remoting_client.mm
diff --git a/remoting/client/ios/session/remoting_client.mm b/remoting/client/ios/session/remoting_client.mm
index bf0ce370f951d0705bd673a90cac4679ad8eb289..88dd80c445e482285d293253c2c2ad66b3bff2c8 100644
--- a/remoting/client/ios/session/remoting_client.mm
+++ b/remoting/client/ios/session/remoting_client.mm
@@ -8,6 +8,8 @@
 
 #import "remoting/client/ios/session/remoting_client.h"
 
+#include <memory>
+
 #import "base/mac/bind_objc_block.h"
 #import "ios/third_party/material_components_ios/src/components/Dialogs/src/MaterialDialogs.h"
 #import "remoting/client/ios/display/gl_display_handler.h"
@@ -18,6 +20,7 @@
 #include "remoting/client/chromoting_client_runtime.h"
 #include "remoting/client/chromoting_session.h"
 #include "remoting/client/connect_to_host_info.h"
+#include "remoting/client/gesture_interpreter.h"
 #include "remoting/client/ios/session/remoting_client_session_delegate.h"
 #include "remoting/protocol/session.h"
 #include "remoting/protocol/video_renderer.h"
@@ -36,6 +39,7 @@ NSString* const kHostSessionPin = @"kHostSessionPin";
   ClientSessionDetails* _sessionDetails;
   // Call _secretFetchedCallback on the network thread.
   remoting::protocol::SecretFetchedCallback _secretFetchedCallback;
+  std::unique_ptr<remoting::GestureInterpreter> _gestureInterpreter;
 }
 @end
 
@@ -108,6 +112,11 @@ NSString* const kHostSessionPin = @"kHostSessionPin";
   base::WeakPtr<remoting::protocol::AudioStub> audioPlayer = nullptr;
 
   _displayHandler = [[GlDisplayHandler alloc] init];
+  __weak GlDisplayHandler* weakDisplayHandler = _displayHandler;
+  _gestureInterpreter.reset(new remoting::GestureInterpreter(
+      base::BindBlockArc(^(const remoting::ViewMatrix& matrix) {
+        [weakDisplayHandler onPixelTransformationChanged:matrix];
+      })));
 
   _runtime->ui_task_runner()->PostTask(
       FROM_HERE, base::BindBlockArc(^{
@@ -138,6 +147,10 @@ NSString* const kHostSessionPin = @"kHostSessionPin";
   return _sessionDetails.hostInfo;
 }
 
+- (remoting::GestureInterpreter*)gestureInterpreter {
+  return _gestureInterpreter.get();
+}
+
 #pragma mark - ChromotingSession::Delegate
 
 - (void)onConnectionState:(remoting::protocol::ConnectionToHost::State)state