Avoid destroying surface before the parent surface stops referencing it.

mojo/services/view_manager/context_factory_impl.cc

Index: mojo/services/view_manager/context_factory_impl.cc
diff --git a/mojo/services/view_manager/context_factory_impl.cc b/mojo/services/view_manager/context_factory_impl.cc
index a4f7d90dcedc4e67e36641b7591559faf1b1d11b..425776e4dc9c9477c17f967d42550f929a398309 100644
--- a/mojo/services/view_manager/context_factory_impl.cc
+++ b/mojo/services/view_manager/context_factory_impl.cc
@@ -5,6 +5,7 @@
 #include "mojo/services/view_manager/context_factory_impl.h"
 
 #include "cc/output/output_surface.h"
+#include "cc/surfaces/surface_id_allocator.h"
 #include "mojo/cc/context_provider_mojo.h"
 #include "ui/compositor/reflector.h"
 #include "ui/gl/gl_implementation.h"
@@ -19,6 +20,7 @@ namespace service {
 ContextFactoryImpl::ContextFactoryImpl(
     ScopedMessagePipeHandle command_buffer_handle)
     : command_buffer_handle_(command_buffer_handle.Pass()),
+      next_surface_id_namespace_(0),
       did_create_(false) {
   DCHECK(command_buffer_handle_.is_valid());
 }
@@ -74,5 +76,11 @@ base::MessageLoopProxy* ContextFactoryImpl::GetCompositorMessageLoop() {
   return NULL;
 }
 
+scoped_ptr<cc::SurfaceIdAllocator>
+ContextFactoryImpl::CreateSurfaceIdAllocator() {
+  return make_scoped_ptr(
+      new cc::SurfaceIdAllocator(next_surface_id_namespace_++));
+}
+
 }  // namespace service
 }  // namespace mojo