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

services/native_viewport/native_viewport_impl.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SERVICES_NATIVE_VIEWPORT_NATIVE_VIEWPORT_IMPL_H_
 #define SERVICES_NATIVE_VIEWPORT_NATIVE_VIEWPORT_IMPL_H_
 
 #include <set>
 
 #include "base/macros.h"
@@ skipping 41 matching lines @@
   void SetEventDispatcher(
       mojo::NativeViewportEventDispatcherPtr dispatcher) override;
 
   // PlatformViewport::Delegate implementation.
   void OnMetricsChanged(mojo::ViewportMetricsPtr metrics) override;
   void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) override;
   void OnAcceleratedWidgetDestroyed() override;
   bool OnEvent(mojo::EventPtr event) override;
   void OnDestroyed() override;
 
+  // Get a weak pointer to this object.
+  base::WeakPtr<NativeViewportImpl> GetWeakPtr();
+  // Notify the associated PlatformViewport that a new native surface is
+  // available. Returns true if the new surface has been attached to, false
+  // otherwise.
+  bool NewNativeSurfaceAvailable();
+
  private:
   // Callback when the dispatcher has processed a message we're waiting on
   // an ack from. |pointer_id| identifies the pointer the message was associated
   // with.
   void AckEvent(int32 pointer_id);
 
   bool is_headless_;
   scoped_ptr<PlatformViewport> platform_viewport_;
   OnscreenContextProvider context_provider_;
   bool sent_metrics_;
   mojo::ViewportMetricsPtr metrics_;
   CreateCallback create_callback_;
   RequestMetricsCallback metrics_callback_;
   mojo::NativeViewportEventDispatcherPtr event_dispatcher_;
   mojo::StrongBinding<mojo::NativeViewport> binding_;
 
   // Set of pointer_ids we've sent a move to and are waiting on an ack.
   std::set<int32> pointers_waiting_on_ack_;
 
   base::WeakPtrFactory<NativeViewportImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewportImpl);
 };
 
 }  // namespace native_viewport
 
 #endif  // SERVICES_NATIVE_VIEWPORT_NATIVE_VIEWPORT_IMPL_H_