services/ui: Use a gpu::GpuChannelHost when creating ui::OutputSurface.

services/ui/public/cpp/context_provider.cc

Index: services/ui/public/cpp/context_provider.cc
diff --git a/services/ui/public/cpp/context_provider.cc b/services/ui/public/cpp/context_provider.cc
index ec1991c3a4030e3cece7b22e0a2d5f1aafdbfc13..93610423f9cd0f5d08b293197276dec8a8ee8d14 100644
--- a/services/ui/public/cpp/context_provider.cc
+++ b/services/ui/public/cpp/context_provider.cc
@@ -7,15 +7,17 @@
 #include <stdint.h>
 
 #include "base/logging.h"
+#include "gpu/ipc/client/gpu_channel_host.h"
 #include "services/ui/public/cpp/gles2_context.h"
 
 namespace ui {
 
-ContextProvider::ContextProvider(GpuService* gpu_service)
-    : gpu_service_(gpu_service) {}
+ContextProvider::ContextProvider(
+    scoped_refptr<gpu::GpuChannelHost> gpu_channel_host)
+    : gpu_channel_host_(std::move(gpu_channel_host)) {}
 
 bool ContextProvider::BindToCurrentThread() {
-  context_ = GLES2Context::CreateOffscreenContext(gpu_service_);
+  context_ = GLES2Context::CreateOffscreenContext(gpu_channel_host_);
   return !!context_;
 }