ResizingHostObserver is created by the desktop environment together with other stubs.

remoting/host/client_session.cc

Index: remoting/host/client_session.cc
diff --git a/remoting/host/client_session.cc b/remoting/host/client_session.cc
index 46bb5c5c7288090d8354100a4325359226e5a04c..a1500660d2992da12da726fc1979a2531167efb4 100644
--- a/remoting/host/client_session.cc
+++ b/remoting/host/client_session.cc
@@ -19,6 +19,7 @@
 #include "remoting/host/audio_scheduler.h"
 #include "remoting/host/desktop_environment.h"
 #include "remoting/host/event_executor.h"
+#include "remoting/host/session_controller.h"
 #include "remoting/host/video_scheduler.h"
 #include "remoting/proto/control.pb.h"
 #include "remoting/proto/event.pb.h"
@@ -94,10 +95,9 @@ void ClientSession::NotifyClientResolution(
     VLOG(1) << "Received ClientResolution (dips_width="
             << resolution.dips_width() << ", dips_height="
             << resolution.dips_height() << ")";
-    event_handler_->OnClientResolutionChanged(
-        this,
-        SkISize::Make(resolution.dips_width(), resolution.dips_height()),
-        SkIPoint::Make(kDefaultDPI, kDefaultDPI));
+    session_controller_->OnClientResolutionChanged(
+        SkIPoint::Make(kDefaultDPI, kDefaultDPI),
+        SkISize::Make(resolution.dips_width(), resolution.dips_height()));

[Jamie, 2013/03/09 00:53:18]

I don't feel strongly about the parameter order here (though the size seems like
the 'primary' parameter to me), but why change it? Is this for consistency with
other functions that take similar parameters?

[alexeypa (please no reviews), 2013/03/09 01:05:34]

This is for consistency with the IPC messages and the DesktopSessionParams
structure.

   }
 }
 
@@ -146,8 +146,12 @@ void ClientSession::OnConnectionChannelsConnected(
   DCHECK_EQ(connection_.get(), connection);
   DCHECK(!audio_scheduler_);
   DCHECK(!event_executor_);
+  DCHECK(!session_controller_);
   DCHECK(!video_scheduler_);
 
+  // Create the session controller.
+  session_controller_ = desktop_environment_->CreateSessionController();
+
   // Create and start the event executor.
   event_executor_ = desktop_environment_->CreateEventExecutor(
       input_task_runner_, ui_task_runner_);
@@ -225,6 +229,7 @@ void ClientSession::OnConnectionClosed(
 
   client_clipboard_factory_.InvalidateWeakPtrs();
   event_executor_.reset();
+  session_controller_.reset();
 
   // Notify the ChromotingHost that this client is disconnected.
   // TODO(sergeyu): Log failure reason?
@@ -266,6 +271,7 @@ void ClientSession::Stop() {
   DCHECK(CalledOnValidThread());
   DCHECK(!audio_scheduler_);
   DCHECK(!event_executor_);
+  DCHECK(!session_controller_);
   DCHECK(!video_scheduler_);
 
   connection_.reset();
@@ -290,6 +296,7 @@ ClientSession::~ClientSession() {
   DCHECK(CalledOnValidThread());
   DCHECK(!audio_scheduler_);
   DCHECK(!event_executor_);
+  DCHECK(!session_controller_);
   DCHECK(!video_scheduler_);
 }