Add a headless configuration to Mojo's native viewport service

mojo/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 "mojo/services/native_viewport/native_viewport_impl.h"
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/application/interface_factory.h"
+#include "mojo/services/native_viewport/platform_viewport_headless.h"
 #include "mojo/services/native_viewport/viewport_surface.h"
 #include "mojo/services/public/cpp/geometry/geometry_type_converters.h"
 #include "mojo/services/public/cpp/input_events/input_events_type_converters.h"
 #include "mojo/services/public/cpp/surfaces/surfaces_type_converters.h"
 #include "ui/events/event.h"
 
 namespace mojo {
 namespace {
 
 bool IsRateLimitedEventType(ui::Event* event) {
   return event->type() == ui::ET_MOUSE_MOVED ||
          event->type() == ui::ET_MOUSE_DRAGGED ||
          event->type() == ui::ET_TOUCH_MOVED;
 }
 
 }  // namespace
 
-NativeViewportImpl::NativeViewportImpl(ApplicationImpl* app)
-    : widget_id_(0u), waiting_for_event_ack_(false), weak_factory_(this) {
+NativeViewportImpl::NativeViewportImpl(ApplicationImpl* app, bool is_headless)
+    : is_headless_(is_headless),
+      widget_id_(0u),
+      waiting_for_event_ack_(false),
+      weak_factory_(this) {
   app->ConnectToService("mojo:mojo_surfaces_service", &surfaces_service_);
   // TODO(jamesr): Should be mojo_gpu_service
   app->ConnectToService("mojo:mojo_native_viewport_service", &gpu_service_);
 }
 
 NativeViewportImpl::~NativeViewportImpl() {
   // Destroy the NativeViewport early on as it may call us back during
   // destruction and we want to be in a known state.
   platform_viewport_.reset();
 }
 
 void NativeViewportImpl::Create(SizePtr bounds) {
-  platform_viewport_ = PlatformViewport::Create(this);
+  if (is_headless_)
+    platform_viewport_ = PlatformViewportHeadless::Create(this);
+  else
+    platform_viewport_ = PlatformViewport::Create(this);
   gfx::Rect rect = gfx::Rect(bounds.To<gfx::Size>());
   platform_viewport_->Init(rect);
   OnBoundsChanged(rect);
 }
 
 void NativeViewportImpl::Show() {
   platform_viewport_->Show();
 }
 
 void NativeViewportImpl::Hide() {
@@ skipping 72 matching lines @@
 void NativeViewportImpl::OnDestroyed() {
   client()->OnDestroyed();
 }
 
 void NativeViewportImpl::AckEvent() {
   waiting_for_event_ack_ = false;
 }
 
 }  // namespace mojo