| Index: gpu/command_buffer/service/feature_info.cc | 
| diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc | 
| index 7190ad4caf9e3aec14a7cd8a0b345b68d66f9ca8..6dd1f34f1ee8c63a508a52bf0613977ca0279e96 100644 | 
| --- a/gpu/command_buffer/service/feature_info.cc | 
| +++ b/gpu/command_buffer/service/feature_info.cc | 
| @@ -858,12 +858,14 @@ void FeatureInfo::InitializeFeatures() { | 
| UMA_HISTOGRAM_BOOLEAN("GPU.FenceSupport", ui_gl_fence_works); | 
|  | 
| feature_flags_.map_buffer_range = | 
| -      is_es3 || extensions.Contains("GL_ARB_map_buffer_range"); | 
| +      is_es3 || extensions.Contains("GL_ARB_map_buffer_range") || | 
| +      extensions.Contains("GL_EXT_map_buffer_range"); | 
|  | 
| // Really it's part of core OpenGL 2.1 and up, but let's assume the | 
| // extension is still advertised. | 
| bool has_pixel_buffers = | 
| -      is_es3 || extensions.Contains("GL_ARB_pixel_buffer_object"); | 
| +      is_es3 || extensions.Contains("GL_ARB_pixel_buffer_object") || | 
| +      extensions.Contains("GL_NV_pixel_buffer_object"); | 
|  | 
| // We will use either glMapBuffer() or glMapBufferRange() for async readbacks. | 
| if (has_pixel_buffers && ui_gl_fence_works && | 
|  |