Enable Ozone software implementation in GYP

ui/gfx/ozone/surface_factory_ozone.cc

Index: ui/gfx/ozone/surface_factory_ozone.cc
diff --git a/ui/gfx/ozone/surface_factory_ozone.cc b/ui/gfx/ozone/surface_factory_ozone.cc
index ca67228d4b1d178e14858c949fcb3f604b22a8b4..8c7cbb9bdd17f0e422762d1aec7c3c489b25ead8 100644
--- a/ui/gfx/ozone/surface_factory_ozone.cc
+++ b/ui/gfx/ozone/surface_factory_ozone.cc
@@ -6,6 +6,8 @@
 
 #include <stdlib.h>
 
+#include "ui/gfx/ozone/impl/software_surface_factory_ozone.h"
+
 namespace gfx {
 
 // static
@@ -42,7 +44,11 @@ SurfaceFactoryOzone::~SurfaceFactoryOzone() {
 }
 
 SurfaceFactoryOzone* SurfaceFactoryOzone::GetInstance() {
-  CHECK(impl_) << "SurfaceFactoryOzone accessed before constructed";
+  if (!impl_) {

[rjkroege, 2013/10/18 14:54:05]

i had a discussion with spang about how this logic should work in the general
for multiple ozone backends so this will need to change in a subsequent CL.
(This comment is for your information, not a request to do anything about it in
this CL.)

[dnicoara, 2013/10/18 16:00:50]

OK, thank you. I remember us talking about this at some point. I know it is just
a temporary solution.

+    LOG(WARNING) << "No SurfaceFactoryOzone implementation set. Using default "
+                    "gfx::SoftwareSurfaceFactoryOzone.";
+    impl_ = new SoftwareSurfaceFactoryOzone();
+  }
   return impl_;
 }