Automatically redraw the display on resume.

services/native_viewport/onscreen_context_provider.h

Index: services/native_viewport/onscreen_context_provider.h
diff --git a/services/native_viewport/onscreen_context_provider.h b/services/native_viewport/onscreen_context_provider.h
index 04115cb5e22e51ba49601f0c3d78bc875bc317b1..43ca00bc8ceb89d467ce166bba1f5de10f18831a 100644
--- a/services/native_viewport/onscreen_context_provider.h
+++ b/services/native_viewport/onscreen_context_provider.h
@@ -29,6 +29,8 @@ class OnscreenContextProvider : public mojo::ContextProvider {
   // mojo::ContextProvider implementation:
   void Create(mojo::ViewportParameterListenerPtr viewport_parameter_listener,
               const CreateCallback& callback) override;
+  void NotifyOnViewportCreated(
+      const NotifyOnViewportCreatedCallback& callback) override;
 
   void CreateAndReturnCommandBuffer();
 
@@ -36,6 +38,7 @@ class OnscreenContextProvider : public mojo::ContextProvider {
   gfx::AcceleratedWidget widget_;
   mojo::ViewportParameterListenerPtr pending_listener_;
   CreateCallback pending_create_callback_;
+  NotifyOnViewportCreatedCallback pending_viewport_callback_;
   mojo::Binding<mojo::ContextProvider> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(OnscreenContextProvider);