[WebVR] Fixes depth issue
[WebVR] Fixes depth issue

beaufortfrancois/samples,dmurph/samples,beaufortfrancois/samples,jeffposnick/samples,beaufortfrancois/samples,rsolomakhin/samples,rsolomakhin/samples,689/samples,GoogleChrome/samples,beaufortfrancois/samples,GoogleChrome/samples,689/samples,GoogleChrome/samples,jeffposnick/samples,jeffposnick/samples,jeffposnick/samples,GoogleChrome/samples,dmurph/samples,rsolomakhin/samples,GoogleChrome/samples,dmurph/samples,689/samples