Do not create the NativeViewport PlatformEventSource when headless.

components/native_viewport/native_viewport_application_delegate.cc

 // Copyright 2015 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 "components/native_viewport/native_viewport_application_delegate.h"
 
 #include "base/command_line.h"
 #include "components/native_viewport/native_viewport_impl.h"
 #include "components/native_viewport/public/cpp/args.h"
 #include "mojo/application/public/cpp/application_connection.h"
 #include "mojo/application/public/cpp/application_impl.h"
 #include "ui/events/event_switches.h"
 #include "ui/events/platform/platform_event_source.h"
 #include "ui/gl/gl_surface.h"
 
 namespace native_viewport {
 
 NativeViewportApplicationDelegate::NativeViewportApplicationDelegate()
     : is_headless_(false) {
 }
 
 NativeViewportApplicationDelegate::~NativeViewportApplicationDelegate() {
 }
 
 void NativeViewportApplicationDelegate::Initialize(
     mojo::ApplicationImpl* application) {
-  event_source_ = ui::PlatformEventSource::CreateDefault();
   tracing_.Initialize(application);
 
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   is_headless_ = command_line->HasSwitch(mojo::kUseHeadlessConfig);
   if (!is_headless_) {
+    event_source_ = ui::PlatformEventSource::CreateDefault();
     if (command_line->HasSwitch(mojo::kUseTestConfig))
       gfx::GLSurface::InitializeOneOffForTests();
     else
       gfx::GLSurface::InitializeOneOff();
   }
 }
 
 bool NativeViewportApplicationDelegate::ConfigureIncomingConnection(
     mojo::ApplicationConnection* connection) {
   connection->AddService<mojo::NativeViewport>(this);
@@ skipping 11 matching lines @@
 
 void NativeViewportApplicationDelegate::Create(
     mojo::ApplicationConnection* connection,
     mojo::InterfaceRequest<mojo::Gpu> request) {
   if (!gpu_state_.get())
     gpu_state_ = new gles2::GpuState;
   new gles2::GpuImpl(request.Pass(), gpu_state_);
 }
 
 }  // namespace native_viewport