Add a headless configuration to Mojo's native viewport service

mojo/shell/context.cc

Index: mojo/shell/context.cc
diff --git a/mojo/shell/context.cc b/mojo/shell/context.cc
index 64db00b05a5023a766b05de76b2da85ca67c6408..4397271cd4632a1aaa693a762cb1b4b264a7c42e 100644
--- a/mojo/shell/context.cc
+++ b/mojo/shell/context.cc
@@ -143,7 +143,7 @@ class Context::NativeViewportApplicationLoader
   // InterfaceFactory<NativeViewport> implementation.
   virtual void Create(ApplicationConnection* connection,
                       InterfaceRequest<NativeViewport> request) OVERRIDE {
-    BindToRequest(new NativeViewportImpl(app_.get()), &request);
+    BindToRequest(new NativeViewportImpl(app_.get(), false), &request);
   }
 
   // InterfaceFactory<Gpu> implementation.