Revert of gpu: Completely remove GpuProcessHostUIShim.

ui/ozone/public/ozone_gpu_test_helper.cc

 // Copyright 2014 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.
 
 #include "ui/ozone/public/ozone_gpu_test_helper.h"
 
 #include "base/threading/thread.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_message.h"
@@ skipping 66 matching lines @@
       : gpu_task_runner_(gpu_task_runner),
         gpu_io_task_runner_(gpu_io_task_runner) {}
   ~FakeGpuProcessHost() {}
 
   void InitOnIO() {
     base::Callback<void(IPC::Message*)> sender =
         base::Bind(&DispatchToGpuPlatformSupportTaskOnIO);
 
     ui::OzonePlatform::GetInstance()
         ->GetGpuPlatformSupportHost()
-        ->OnGpuProcessLaunched(kGpuProcessHostId, gpu_task_runner_,
-                               gpu_io_task_runner_, sender);
+        ->OnGpuProcessLaunched(kGpuProcessHostId, gpu_io_task_runner_, sender);
+  }
+
+  void InitOnUI() {
+    ui::OzonePlatform::GetInstance()
+        ->GetGpuPlatformSupportHost()
+        ->OnChannelEstablished();
   }
 
  private:
   scoped_refptr<base::SingleThreadTaskRunner> gpu_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> gpu_io_task_runner_;
 };
 
 OzoneGpuTestHelper::OzoneGpuTestHelper() {
 }
 
@@ skipping 13 matching lines @@
       FROM_HERE, base::Bind(&FakeGpuProcess::InitOnIO,
                             base::Unretained(fake_gpu_process_.get())));
 
   fake_gpu_process_host_.reset(new FakeGpuProcessHost(
       gpu_task_runner, io_helper_thread_->task_runner()));
   io_helper_thread_->task_runner()->PostTask(
       FROM_HERE, base::Bind(&FakeGpuProcessHost::InitOnIO,
                             base::Unretained(fake_gpu_process_host_.get())));
   io_helper_thread_->FlushForTesting();
 
+  fake_gpu_process_host_->InitOnUI();
   return true;
 }
 
 }  // namespace ui