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

services/native_viewport/platform_viewport_headless.cc

 // Copyright 2013 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/platform_viewport_headless.h"
 
 #include "mojo/converters/geometry/geometry_type_converters.h"
 
 namespace native_viewport {
 
 PlatformViewportHeadless::PlatformViewportHeadless(Delegate* delegate)
-    : delegate_(delegate) {
-}
+    : delegate_(delegate) {}
 
-PlatformViewportHeadless::~PlatformViewportHeadless() {
-}
+PlatformViewportHeadless::~PlatformViewportHeadless() {}
 
 void PlatformViewportHeadless::Init(const gfx::Rect& bounds) {
   metrics_ = mojo::ViewportMetrics::New();
   metrics_->size = mojo::Size::From(bounds.size());
 }
 
-void PlatformViewportHeadless::Show() {
-}
+void PlatformViewportHeadless::Show() {}
 
-void PlatformViewportHeadless::Hide() {
-}
+void PlatformViewportHeadless::Hide() {}
 
 void PlatformViewportHeadless::Close() {
   delegate_->OnDestroyed();
 }
 
 gfx::Size PlatformViewportHeadless::GetSize() {
   return metrics_->size.To<gfx::Size>();
 }
 
 void PlatformViewportHeadless::SetBounds(const gfx::Rect& bounds) {
   metrics_->size = mojo::Size::From(bounds.size());
   delegate_->OnMetricsChanged(metrics_->Clone());
 }
 
+bool PlatformViewportHeadless::NewNativeSurfaceAvailable() {
+  NOTREACHED() << "Cannot attach a headless viewport to a native surface.";
+  return false;
+}
+
 // static
 scoped_ptr<PlatformViewport> PlatformViewportHeadless::Create(
     Delegate* delegate) {
-  return scoped_ptr<PlatformViewport>(
-      new PlatformViewportHeadless(delegate)).Pass();
+  return scoped_ptr<PlatformViewport>(new PlatformViewportHeadless(delegate))
+      .Pass();
 }
 
 }  // namespace native_viewport