Revert of gpu: Completely remove GpuProcessHostUIShim.

ui/ozone/public/gpu_platform_support_host.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/gpu_platform_support_host.h"
 
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
 
 namespace ui {
 
 namespace {
 
 // No-op implementations of GpuPlatformSupportHost.
 class StubGpuPlatformSupportHost : public GpuPlatformSupportHost {
  public:
   // GpuPlatformSupportHost:
   void OnGpuProcessLaunched(
       int host_id,
-      scoped_refptr<base::SingleThreadTaskRunner> ui_runner,
       scoped_refptr<base::SingleThreadTaskRunner> send_runner,
       const base::Callback<void(IPC::Message*)>& send_callback) override {}
 
+  void OnChannelEstablished() override {}
+
   void OnChannelDestroyed(int host_id) override {}
   bool OnMessageReceived(const IPC::Message&) override { return false; }
 };
 
 }  // namespace
 
 GpuPlatformSupportHost::GpuPlatformSupportHost() {
 }
 
 GpuPlatformSupportHost::~GpuPlatformSupportHost() {
 }
 
 GpuPlatformSupportHost* CreateStubGpuPlatformSupportHost() {
   return new StubGpuPlatformSupportHost;
 }
 
 }  // namespace ui