Enable Ozone software implementation in GYP

ui/gfx/ozone/surface_factory_ozone.cc

 // Copyright (c) 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 "ui/gfx/ozone/surface_factory_ozone.h"
 
 #include <stdlib.h>
 
+#include "ui/gfx/ozone/impl/software_surface_factory_ozone.h"
+
 namespace gfx {
 
 // static
 SurfaceFactoryOzone* SurfaceFactoryOzone::impl_ = NULL;
 
 class SurfaceFactoryOzoneStub : public SurfaceFactoryOzone {
  public:
   SurfaceFactoryOzoneStub() {}
   virtual ~SurfaceFactoryOzoneStub() {}
 
@@ skipping 16 matching lines @@
   }
 };
 
 SurfaceFactoryOzone::SurfaceFactoryOzone() {
 }
 
 SurfaceFactoryOzone::~SurfaceFactoryOzone() {
 }
 
 SurfaceFactoryOzone* SurfaceFactoryOzone::GetInstance() {
-  CHECK(impl_) << "SurfaceFactoryOzone accessed before constructed";
+  if (!impl_) {
+    LOG(WARNING) << "No SurfaceFactoryOzone implementation set. Using default "
+                    "gfx::SoftwareSurfaceFactoryOzone.";
+    impl_ = new SoftwareSurfaceFactoryOzone();
+  }
   return impl_;
 }
 
 void SurfaceFactoryOzone::SetInstance(SurfaceFactoryOzone* impl) {
   impl_ = impl;
 }
 
 const char* SurfaceFactoryOzone::DefaultDisplaySpec() {
   char* envvar = getenv("ASH_DISPLAY_SPEC");
   if (envvar)
@@ skipping 17 matching lines @@
     const int32* desired_attributes) {
   return desired_attributes;
 }
 
 // static
 SurfaceFactoryOzone* SurfaceFactoryOzone::CreateTestHelper() {
   return new SurfaceFactoryOzoneStub;
 }
 
 }  // namespace gfx