services/ui: Split GpuServiceInternal into gpu vs. ws pieces.

services/ui/ws/platform_display.cc

Index: services/ui/ws/platform_display.cc
diff --git a/services/ui/ws/platform_display.cc b/services/ui/ws/platform_display.cc
index 4f9c32c8ec4449e366556b9e894999bcb6b0ac18..e0f215a9d516bb362aa25789aa6ca5ff8e4f3b64 100644
--- a/services/ui/ws/platform_display.cc
+++ b/services/ui/ws/platform_display.cc
@@ -9,6 +9,7 @@
 #include "cc/ipc/quads.mojom.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/output/delegated_frame_data.h"
+#include "gpu/ipc/client/gpu_channel_host.h"
 #include "services/shell/public/cpp/connection.h"
 #include "services/shell/public/cpp/connector.h"
 #include "services/ui/surfaces/display_compositor.h"
@@ -171,6 +172,11 @@ bool DefaultPlatformDisplay::IsPrimaryDisplay() const {
   return platform_screen_->GetPrimaryDisplayId() == id_;
 }
 
+void DefaultPlatformDisplay::OnGpuChannelEstablished(
+    scoped_refptr<gpu::GpuChannelHost> channel) {
+  frame_generator_->OnGpuChannelEstablished(channel);
+}
+
 void DefaultPlatformDisplay::UpdateMetrics(const gfx::Rect& bounds,
                                            float device_scale_factor) {
   if (display::Display::HasForceDeviceScaleFactor())