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

shell/android/native_viewport_application_loader.h

Index: shell/android/native_viewport_application_loader.h
diff --git a/shell/android/native_viewport_application_loader.h b/shell/android/native_viewport_application_loader.h
index 4eeb4c6af28f3b5fb7efd2aff798d5315b1a3afe..db8b84da501b82294c79986b5d1f22bc7cfc2990 100644
--- a/shell/android/native_viewport_application_loader.h
+++ b/shell/android/native_viewport_application_loader.h
@@ -5,6 +5,7 @@
 #ifndef MOJO_SHELL_ANDROID_NATIVE_VIEWPORT_APPLICATION_LOADER_H_
 #define MOJO_SHELL_ANDROID_NATIVE_VIEWPORT_APPLICATION_LOADER_H_
 
+#include "mojo/common/binding_set.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/interface_factory.h"
 #include "mojo/services/gpu/public/interfaces/gpu.mojom.h"
@@ -20,11 +21,17 @@ namespace mojo {
 class ApplicationImpl;
 }  // namespace mojo
 
+namespace native_viewport {
+class NativeViewportImpl;
+}  // namespace native_viewport
+
 namespace shell {
 
 class NativeViewportApplicationLoader
     : public ApplicationLoader,
       public mojo::ApplicationDelegate,
+      public mojo::NativeViewportShellService,
+      public mojo::InterfaceFactory<mojo::NativeViewportShellService>,
       public mojo::InterfaceFactory<mojo::NativeViewport>,
       public mojo::InterfaceFactory<mojo::Gpu> {
  public:
@@ -49,8 +56,20 @@ class NativeViewportApplicationLoader
   void Create(mojo::ApplicationConnection* connection,
               mojo::InterfaceRequest<mojo::Gpu> request) override;
 
+  // mojo::InterfaceFactory<NativeViewportShellService> implementation.
+  void Create(
+      mojo::ApplicationConnection* connection,
+      mojo::InterfaceRequest<NativeViewportShellService> request) override;
+
+  // mojo::NativeViewportShellService implementation
+  void NewNativeSurfaceAvailable() override;
+
   scoped_refptr<gles2::GpuState> gpu_state_;
   scoped_ptr<mojo::ApplicationImpl> app_;
+  mojo::BindingSet<mojo::NativeViewportShellService>
+      native_viewport_shell_service_bindings_;
+  std::queue<base::WeakPtr<native_viewport::NativeViewportImpl>>
+      native_viewports_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewportApplicationLoader);
 };