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

services/native_viewport/native_viewport_impl.cc

 // 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.
 
 #include "services/native_viewport/native_viewport_impl.h"
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 145 matching lines @@
 }
 
 void NativeViewportImpl::OnDestroyed() {
   delete this;
 }
 
 void NativeViewportImpl::AckEvent(int32 pointer_id) {
   pointers_waiting_on_ack_.erase(pointer_id);
 }
 
+base::WeakPtr<NativeViewportImpl> NativeViewportImpl::GetWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
+bool NativeViewportImpl::NewNativeSurfaceAvailable() {
+  return platform_viewport_->NewNativeSurfaceAvailable();
+}
+
 }  // namespace native_viewport