The WebGL extension EXT_shader_texture_lod which mirrors the ES Extension http://www.khronos.org/registry/gles/extensions/EXT/EXT_shader_texture_lod.txt may now be implemented. The functionality is also part of OpenGL ES 3.0.
Chrome ticket: https://code.google.com/p/chromium/issues/detail?id=344583
Firefox ticket: https://bugzilla.mozilla.org/show_bug.cgi?id=965848
Changing title to reflect iOS. This was already implemented for other platforms in https://bugs.webkit.org/show_bug.cgi?id=128985
Created attachment 232732 [details]
Created attachment 232739 [details]
Comment on attachment 232739 [details]
Clearing flags on attachment: 232739
Committed r169730: <http://trac.webkit.org/changeset/169730>
All reviewed patches have been landed. Closing bug.