Fix gpu_ipc_service_unittests on mac_chromium_rel_ng by managing GL shared groups the same way in s…

ui/gl/gl_context_ozone.cc

Index: ui/gl/gl_context_ozone.cc
diff --git a/ui/gl/gl_context_ozone.cc b/ui/gl/gl_context_ozone.cc
index d62b5686b9ed63b0ac5e5a18984dafc0326e905a..3727c656c160069b86a852e8692df16d1f2e9699 100644
--- a/ui/gl/gl_context_ozone.cc
+++ b/ui/gl/gl_context_ozone.cc
@@ -24,7 +24,7 @@ scoped_refptr<GLContext> GLContext::CreateGLContext(
 
   switch (GetGLImplementation()) {
     case kGLImplementationMockGL:
-      return scoped_refptr<GLContext>(new GLContextStub());
+      return scoped_refptr<GLContext>(new GLContextStub(share_group));
     case kGLImplementationOSMesaGL: {
       scoped_refptr<GLContext> context(new GLContextOSMesa(share_group));
       if (!context->Initialize(compatible_surface, gpu_preference))
@@ -44,4 +44,3 @@ scoped_refptr<GLContext> GLContext::CreateGLContext(
 }
 
 }  // namespace gfx
-