[Ozone] Initialize the message filter from the dummy channel

ui/ozone/public/ui_thread_gpu.cc

Index: ui/ozone/public/ui_thread_gpu.cc
diff --git a/ui/ozone/public/ui_thread_gpu.cc b/ui/ozone/public/ui_thread_gpu.cc
index ccc98495fc40c6fc4aa83939b47e102f63e75c6f..e64e13ccca18284c6ff0c446dd309d424ee2bab5 100644
--- a/ui/ozone/public/ui_thread_gpu.cc
+++ b/ui/ozone/public/ui_thread_gpu.cc
@@ -8,6 +8,7 @@
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_sender.h"
+#include "ipc/message_filter.h"
 #include "ui/ozone/public/gpu_platform_support.h"
 #include "ui/ozone/public/gpu_platform_support_host.h"
 #include "ui/ozone/public/ozone_platform.h"
@@ -29,6 +30,11 @@ class FakeGpuProcess : public IPC::Sender {
     task_runner_ = base::ThreadTaskRunnerHandle::Get();
     ui::OzonePlatform::GetInstance()
         ->GetGpuPlatformSupport()
+        ->GetMessageFilter()
+        ->OnFilterAdded(this);
+
+    ui::OzonePlatform::GetInstance()
+        ->GetGpuPlatformSupport()
         ->OnChannelEstablished(this);
   }