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

services/native_viewport/platform_viewport_x11.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.h"
 
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "mojo/converters/input_events/input_events_type_converters.h"
@@ skipping 16 matching lines @@
   return std::max(
       -1.0f, std::min(1.0f, static_cast<float>(offset) /
                                 (20 * static_cast<float>(
                                           ui::MouseWheelEvent::kWheelDelta))));
 }
 }  // namespace
 
 class PlatformViewportX11 : public PlatformViewport,
                             public ui::PlatformWindowDelegate {
  public:
-  explicit PlatformViewportX11(Delegate* delegate) : delegate_(delegate) {
-  }
+  explicit PlatformViewportX11(Delegate* delegate) : delegate_(delegate) {}
 
   ~PlatformViewportX11() override {
     // Destroy the platform-window while |this| is still alive.
     platform_window_.reset();
   }
 
  private:
   // Overridden from PlatformViewport:
   void Init(const gfx::Rect& bounds) override {
     CHECK(!event_source_);
@@ skipping 95 matching lines @@
   void OnWindowStateChanged(ui::PlatformWindowState state) override {}
 
   void OnLostCapture() override {}
 
   void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) override {
     delegate_->OnAcceleratedWidgetAvailable(widget);
   }
 
   void OnActivationChanged(bool active) override {}
 
+  bool NewNativeSurfaceAvailable() override {
+    NOTIMPLEMENTED() << "Native surface attaching not implemented.";
+    return false;
+  }
+
   scoped_ptr<ui::PlatformEventSource> event_source_;
   scoped_ptr<ui::PlatformWindow> platform_window_;
   Delegate* delegate_;
   mojo::ViewportMetricsPtr metrics_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformViewportX11);
 };
 
 // static
 scoped_ptr<PlatformViewport> PlatformViewport::Create(Delegate* delegate) {
   return make_scoped_ptr(new PlatformViewportX11(delegate));
 }
 
 }  // namespace native_viewport