| Index: chrome/browser/android/vr_shell/vr_math.cc | 
| diff --git a/chrome/browser/android/vr_shell/vr_math.cc b/chrome/browser/android/vr_shell/vr_math.cc | 
| index 1438010c8061477ca0d62800d0cb3896de0d4864..0994a51bfd855e48a4d7940f06d8f7f50138fd70 100644 | 
| --- a/chrome/browser/android/vr_shell/vr_math.cc | 
| +++ b/chrome/browser/android/vr_shell/vr_math.cc | 
| @@ -6,6 +6,8 @@ | 
|  | 
| #include <cmath> | 
|  | 
| +#include "base/logging.h" | 
| + | 
| namespace vr_shell { | 
|  | 
| // Internal matrix layout: | 
| @@ -106,7 +108,7 @@ gvr::Mat4f PerspectiveMatrixFromView(const gvr::Rectf& fov, | 
| const float y_bottom = -std::tan(fov.bottom * M_PI / 180.0f) * z_near; | 
| const float y_top = std::tan(fov.top * M_PI / 180.0f) * z_near; | 
|  | 
| -  assert(x_left < x_right && y_bottom < y_top && z_near < z_far && | 
| +  DCHECK(x_left < x_right && y_bottom < y_top && z_near < z_far && | 
| z_near > 0.0f && z_far > 0.0f); | 
| const float X = (2 * z_near) / (x_right - x_left); | 
| const float Y = (2 * z_near) / (y_top - y_bottom); | 
|  |