Allow native_viewport to create new native windows on demand on Android.

shell/android/native_viewport_application_loader.cc

Index: shell/android/native_viewport_application_loader.cc
diff --git a/shell/android/native_viewport_application_loader.cc b/shell/android/native_viewport_application_loader.cc
index 765044707a68e11737e07378d2972445062138d2..34450a9b8b9fb392336e794af16cab8917e1bf46 100644
--- a/shell/android/native_viewport_application_loader.cc
+++ b/shell/android/native_viewport_application_loader.cc
@@ -38,7 +38,8 @@ void NativeViewportApplicationLoader::Create(
     InterfaceRequest<mojo::NativeViewport> request) {
   if (!gpu_state_)
     gpu_state_ = new gles2::GpuState;
-  new native_viewport::NativeViewportImpl(false, gpu_state_, request.Pass());
+  new native_viewport::NativeViewportImpl(app_.get(), false, gpu_state_,
+                                          request.Pass());
 }
 
 void NativeViewportApplicationLoader::Create(