title: WEBGL_draw_buffers not supported on chrome 37
body: <p>I have trouble getting the webgl extension <code>WEBGL_draw_buffers</code> on chrome. My GPU should definitely support multiple draw buffers, Firefox supports the extension, but Chrome does not list it. Is there any reason for the missing support?</p>
  
  <h2>general info</h2>
  
  <ul>
  <li>Browser: Chrome 37.0.2062.102 m (same result with version 36 and 38)</li>
  <li>Browser command line: <code>Files (x86)\Google\Chrome\Application\chrome.exe" --flag-switches-begin --js-flags=--harmony --enable-webgl-draft-extensions --flag-switches-end</code></li>
  <li>Operating system: Windows 8.1 Pro</li>
  <li>GPU: NVS 3100M (driver version 327.02)</li>
  <li>Notebook: ThinkPad T410</li>
  <li>Other people seem to get <code>WEBGL_draw_buffers</code> support on Chrome</li>
  <li>I did not find any information about Chrome bugs related to disabled multiple draw buffers.</li>
  </ul>
  
  <h2>webgl extensions available</h2>
  
  <pre><code>GL_OES_element_index_uint GL_OES_packed_depth_stencil GL_OES_get_program_binary GL_OES_rgb8_rgba8 NV_pixel_buffer_object GL_OES_mapbuffer GL_EXT_map_buffer_range GL_OES_standard_derivatives GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_float GL_OES_texture_float_linear GL_EXT_texture_rg GL_OES_texture_npot GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_shader_texture_lod GL_EXT_texture_compression_dxt1 GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_storage GL_EXT_frag_depth GL_EXT_blend_minmax GL_ANGLE_depth_texture GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_pack_reverse_row_order GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_NV_fence
  </code></pre>
  
  <h2>chrome://gpu problems reported</h2>
  
  <pre><code>Problems Detected
  GPU rasterization is whitelisted on N4, N5, N7 and Moto X: 362779
  Disabled Features: gpu_rasterization
  Additional GPU rasterization whitelist for field trial: 380694
  Disabled Features: gpu_rasterization_field_trial
  Always call glUseProgram after a successful link to avoid a driver bug: 349137
  Applied Workarounds: use_current_program_after_successful_link
  Some drivers are unable to reset the D3D device in the GPU process sandbox
  Applied Workarounds: exit_on_context_lost
  TexSubImage2D() is faster for full uploads on ANGLE
  Applied Workarounds: texsubimage2d_faster_than_teximage2d
  Clear uniforms before first program use on all platforms: 124764, 349137
  Applied Workarounds: clear_uniforms_before_first_program_use
  Threaded rasterization has not been enabled or is not supported by the current system.
  Disabled Features: threaded_rasterization
  </code></pre>