Automatically redraw the display on resume.

services/native_viewport/onscreen_context_provider.cc

Index: services/native_viewport/onscreen_context_provider.cc
diff --git a/services/native_viewport/onscreen_context_provider.cc b/services/native_viewport/onscreen_context_provider.cc
index c34ff865c36cc74aba74ba189973f1c2c3a8fc4c..66f4987cb04188806287d060e9f32ceccd55d277 100644
--- a/services/native_viewport/onscreen_context_provider.cc
+++ b/services/native_viewport/onscreen_context_provider.cc
@@ -23,12 +23,23 @@ void OnscreenContextProvider::Bind(
   binding_.Bind(request.Pass());
 }
 
+void OnscreenContextProvider::NotifyOnViewportCreated(
+    const NotifyOnViewportCreatedCallback& callback) {
+  pending_viewport_callback_ = callback;
+}
+
 void OnscreenContextProvider::SetAcceleratedWidget(
     gfx::AcceleratedWidget widget) {
   widget_ = widget;
-  if (widget_ != gfx::kNullAcceleratedWidget &&
-      !pending_create_callback_.is_null())
-    CreateAndReturnCommandBuffer();
+  if (widget_ != gfx::kNullAcceleratedWidget) {
+    if (!pending_viewport_callback_.is_null()) {
+      pending_viewport_callback_.Run();
+      pending_viewport_callback_.reset();
+    }
+    if (!pending_create_callback_.is_null()) {
+      CreateAndReturnCommandBuffer();
+    }
+  }
 }
 
 void OnscreenContextProvider::Create(