Revert "Revert 130384 - Broke a few Mac bots"

webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc

Index: webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
diff --git a/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc b/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
index 8ad9cc1a8f84177e32790dcb93814b5432f7d940..c64e861b0f7289e76d1dfb4f878707609104335d 100644
--- a/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
+++ b/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
@@ -462,7 +462,7 @@ bool GLInProcessContext::Initialize(const gfx::Size& size,
   // Create the object exposing the OpenGL API.
   gles2_implementation_.reset(new GLES2Implementation(
       gles2_helper_.get(),
-      NULL,
+      context_group ? context_group->GetImplementation()->share_group() : NULL,
       transfer_buffer_.get(),
       true,
       false));