On S7 Gear VR with Mali chips I see no bounce light effect. The effect is clearly visible on the same device in a non-VR app, and in the Editor in Play mode when the Mock HMD device is chosen in Player settings.

This was tested using a simple scene lit only by a directional light which shines upon a multi-colored plane. A white plane is oriented to receive no directional light, but to receive indirect light bounced off of the colored plane.